Aaron Cockman, 42, Margaret River, WA shares his horrific story:
I shuffled the pile of bills in my hands and it made my stomach sink.
โWeโre two months behind on the mortgage, the credit cardโs maxed, and weโre building a house,โ I sighed to my wife, Katrina, in frustration.
I worked as a carpenter while Katrina home-schooled our four kids: Taye, nine, Rylan, eight, Ayre, seven and Kadyn, four.
Money was tight, but there was plenty of love in our family.
The kids were the light of my life. My son Ayre was my little shadow and I was sure heโd follow in my footsteps to become a carpenter, too.
But when the reality of our huge mortgage really started to hit home, we had to borrow from our parents.
Trouble was, our expenses were far more than my single wage brought in.
We soon realised it would be best to move in with Katrinaโs parents, Peter and Cynda Miles, who lived just minutes away, to save money while I finished renovating our house.

Taye Cockman.
(Image exclusive to Take 5)Peter, a quiet, introverted man, was a good mate, while Cynda was a doting granny who loved helping out with the kids.
โThanks for this,โ I said to them. โOnce weโre back on track, weโll get out of your hair.โ
I worked my guts out so thatโd happen sooner rather than later.
The stress of it all meant Katrina and I had our ups and downs.
I hoped that life would be easier once our debts were cleared.
But Peter and Cynda blamed me for our financial problems, and Katrina usually sided with them.
Many times, I bit my tongue.
I knew that things hadnโt been easy for my in-laws: Katrinaโs brother, Shaun, had taken his life 15 years earlier, and Peterโs own mental health wasnโt great after suffering a nervous breakdown.
Just two months after weโd moved in, Peter barred me from the property.
โYouโre not allowed on this driveway anymore,โ he thundered.
Devastated and confused, I moved back into our home, which was now complete except for part of the interior top storey.

Rylan Cockman.
(Image exclusive to Take 5)I wasnโt even allowed to see my kids anymore.
I tried talking to Katrina about what was happening, but she refused to discuss it.
Using her dadโs lawyer to write formal legal letters, Katrina claimed that Iโd abandoned my family and demanded $900 a week, plus medical and vehicle expenses.
In a good week, I made $1500, often much less. To pay the mortgage, Katrinaโs rent to her parents, plus the other bills was impossible.
My parents offered to pay to finish the house and fund a rental property for us.
โLet us buy the whole thing out, including the debts,โ Dad said.
But through their lawyer, Peter said no.
My parentsโ idea made sense to me, but Katrina rejected the idea, claiming Iโd flouted building codes.

My dad and sister helping build the house.
(Image exclusive to Take 5)It wasnโt like her to be so aggressive. I could only think her parents had brainwashed her; theyโd always had a lot of influence over her.
She sprung me with a stop-work order from the council, preventing me from finishing the build.
My lawyer explained that agreeing to an uncontested Violence Restraining Order (VRO) was the best way to see the kids as soon as possible.
All I wanted was to be with them again, so, ridiculous as it seemed, I agreed to an uncontested VRO, which meant I couldnโt contact Katrina or the kids until the court said otherwise.
I didnโt care about the VRO or even really understand what it was โ I just wanted to see my kids.

Ayre Cockman.
(Image exclusive to Take 5)Then I saw Katrinaโs VRO statement. Sheโd alleged I was abusive to her and our children.
I was speechless โ Iโd never raised a hand to her or the kids.
It took six months before I was allowed supervised visits. In that time, I suffered panic attacks, couldnโt sleep and drove around town, desperate for a glimpse of my kids who I missed so much.
Sometimes I wondered if Iโd ever see them again.
Taye, a talented artist, was a creative girl who could paint and draw beautifully.
Rylan, our gentle giant, had size-13 feet. He loved history and reading comics.
I dreamed that Ayre would be my little chippy apprentice one day.
Kadyn, the baby, was a funny little boy who said exactly what was on his mind.
โI see why estranged dads kill themselves,โ I told my parents, utterly heartbroken.
โWhy is Katrina doing this?โ Dad asked.
โHer parents are behind it,โ I replied.
Peter wasnโt the sort of bloke to sit down and chat over things. His response to a problem was to fight, pushed on by Cynda.
Dad became very worried about their hostility and Peterโs stability.
By the time I got supervised visits with the kids, theyโd been turned against me and would only show some affection by the end of each visit.
โGo away, Dad,โ Taye said once, spitting on me.
I was shattered.
โKatrina will make sure you and your parents never see the kids again,โ Cynda snapped one day.
My in-laws, Katrina and the kids moved to a farm in Osmington, 20km from Margaret River.
Meanwhile, an investigation by the Department for Child Protection and Family Support cleared me of all the allegations.

Katrinia, Peter and Cynda with the kids at a family wedding.
(Image: ABC News)The Family Court made an order about the kidsโ living arrangements.
The law prevents me from talking about the specifics, but they continued living at the farm, in defiance of the order which wasnโt enforced.
I rarely saw my children at all then.
But when I did, it was just me, them and Katrina. With her parents out of the picture, things were far more civil between us.
It still took the kids time to warm up to me because these meetings were so infrequent, but soon it was just like old times.
โI miss you, Katrina,โ I confessed to her one day.
โMiss you too,โ she smiled.
Later, we snatched some time alone and made love.
โDonโt tell anyone,โ she hushed afterwards, fearing her parents would think sheโd betrayed them.
I couldnโt understand why something that could have been sorted out with some discussion had escalated so quickly, but Katrinaโs parents had always had a huge influence over her.

Kadyn Cockman.
(Image exclusive to Take 5)I knew she was too scared to go against them.
One time Katrina and I took the kids to the cinema, then went out for ice-cream afterwards.
โItโs just like old times,โ I grinned happily.
The next time I saw the kids, we went snorkelling.
Although the water was freezing, none of us wanted to end the fun and go home.
Finally, things between me and my family were getting back on track.
Then, a few weeks later when I was at work, I got a voice message from the police asking to see me.
They didnโt say what it was about, so I figured Peter and Cynda had made another complaint about me.

Rylan when we went snorkelling as a family.
(Image exclusive to Take 5)As I wandered towards my workmates to tell them I had to go, they were gathered around the radio, shocked by the news being broadcast.
โFour kids and three adults are dead near Margaret River,โ one of my mates sighed.
My heart sankโฆ surely not?
โMate, I think thatโs my kids,โ I stammered.
Iโm not sure why, but somehow I just knew.
My whole body started shaking, as I wondered if my instincts were right.
The police soon arrived.
โIs it true? Is it my kids?โ I asked one officer.
He nodded and, in that small action, my whole world came crashing down.
This isnโt happening, I thought, frozen with shock.

Kadyn and me, in happier times.
(Image exclusive to Take 5)At the station, officers explained my three eldest, Taye, 13, Rylan, 12, and Ayre, 10, had been shot dead as they slept.
Kadyn, eight, had been with Katrina, 35, in her bed and theyโd both been shot dead too.
Cynda was dead on the living-room floor.
Peter had killed them all, then called the cops before turning the gun on himself.
The police showed me a suicide note Peter had left, which said I should get the contents of the house.
At first I thought he was leaving me everything in the house.
But I soon realised thatโs not what he meant. By โcontentsโ I think he meant my dead children.
It was too wicked to bear: I wanted to die to be with my children. What else was left for me to live for?
As news of the massacre spread, it was called Australiaโs worst mass shooting since Port Arthur.
Somehow, I got through the funeral, but the memory of four small coffins lined up will haunt me forever.
For months afterwards, I didnโt sleep or eat and existed in a permanent daze.
People wondered why Peter would do something so twisted and cruel.

Ayre and Kadyn.
(Image exclusive to Take 5)I believe he didnโt want to live anymore and decided to take his whole family with him, so they wouldnโt experience the pain of losing him.
Getting through each day has been hard when I donโt really have anything or anyone left anymore.
I have nightmares about the kidsโ final moments. Sometimes I dream theyโre still alive. I still love and miss Katrina as well.
Iโve since set up the aaron4kidsfoundation in association with For Kids Sake organisation.
Together, weโre campaigning for a fresh approach to family separation and divorce โ treating these as a health and social issue, instead of a legal issue involving family courts.
Iโm a father of four but, thanks to our broken legal system, ashes are all I have left of my beloved children.
One day, Iโll scatter them in the ocean โ but not yet.
I lost my kids to a horrific tragedy and Iโm not ready to let them go forever.
Philip Cockman, 65, Geographe, WA.
My son Aaron put his head in his hands and sobbed.
โI just wanna see my kids,โ he wept.
Heโd been driven to tears by lawyers acting for his estranged wife, Katrina, and her parents, Peter and Cynda.
Aaron was strong, but he was still only human.
โHow much more can he take?โ I asked his worried mum, Kim, later.
At first, theyโd seemed like the perfect family. Aaron adored Katrina, but she could be controlling.
Insisting the kids were autistic, she said she knew how to treat them โ with alternative therapies, special diets and medications.
We werenโt allowed to wear perfume or aftershave when we visited, as Katrina insisted it would affect the kidsโ behaviour.
When they ran into financial trouble, Peter demanded they pay back the $45,000 heโd put into their half-finished home. Aaron continued to pay this off weekly until it was settled.
Then they threw Aaron out of their house. I met up with Peter and Cynda at Katrina and Aaronโs place, hoping to resolve things.
โThis is all bulls**t. I just want this place finished and sold so I can get my money back,โ Peter said.
Kim and I had put money into the house, too. With that common ground, I thought we had something to work on.
But Cynda wasnโt having any of it.
โMen! You all disgust me,โ she sneered.
A fortnight later, they and Katrina began legal action against Aaron, claiming heโd abandoned his family.
We made an offer to purchase the debt, including Peterโs, but they refused, issuing stop-work orders on the house.
They made false allegations and groomed the kids to hate Aaron and us.
We hardly saw the kids over the next few years.
Peter and Cynda became so hateful, I insured Aaronโs life, fearing Peter would kill him.
โI canโt believe itโs come to this,โ I said to Kim.

From left: Aaron, Katrina, Rylan, Kim, Taye, Kadyn and Ayre.
(Image exclusive to Take 5)For them, it was about winning at all costs, not what was best for the kids.
They spread rumours around town that Aaron was an abuser.
He tried not to burden us with it, but I knew it was destroying him.
I was at work one day when my son-in-law, Shane, called in tears.
โThereโs been a shooting at Peter and Cyndaโs,โ he cried. โThe children have been shot, adults too. Aaron canโt be found.โ
I wept for everyone, including Aaron, who I thought was dead in a ditch somewhere, killed by Peter. Iโd seen how irrational and angry he and Cynda were.
It took 90 minutes before I heard he was safe. I knew instantly that Peter was responsible for the murders and that they could have been avoided.
Iโd been a senior prison officer. The world Iโd worked in was structured.
Family law wasnโt like that.Pitting lawyers against each other in a custody fight gave them a licence to create hate and print money.
Exhausted by legal fights, I believe Peter had had enough.

Aaron (third from left) with his siblings and parents.
(Image exclusive to Take 5)Using my experience with the case managers of violent offenders, Iโve been thinking about the changes that could help prevent a repeat of a family tragedy like ours.
First, VRO applications must be examined and graded. One lawyer should act for both parents and on a set fee.
There must be mental health assessments and mediation.
Then, all orders, reports, access restrictions and supervision have to be dealt with quickly and treated as a priority to avoid mental health harm.
Any court orders have to be enforced and reviewed.
Now, Aaronโs called for a Royal Commission into the Family Court.
My son is an honest man, trying to make something positive come from this avoidable tragedy.
If things donโt change, more kids will die.
To help Aaronโs campaign, learn more about the Aaron 4 Kids Foundation here. Any proceeds from this article will go to this non-profit organisation.
If you or someone you know is struggling to cope, contact Lifeline on 13 11 14 or visit the Lifeline website.