@PopsicleHustler thank you, I'm so sorry for what you went through too. I really don't understand how they got away with it. Teachers, doctors etc must have known.
To answer your question, my dad found out I knew when they separated. My dad had an affair, my mum found out when the woman knocked on our front door one night. My mum then disappeared for a few days in thd car and my dad moved out. I was only just 16 when this happened. My brother came round and fixed the front door as it had been broken. I was left alone for a few days not knowing where either of them were. When they fought that night my mum had told my dad I knew. When the dust settled my dad forgave me as I was a child. He had been taking drugs for the last couple of years of their marriage. A few months after their marriage collapsed he called me as he had over dosed. Me and my boyfriend found him and called an ambulance.
My dad eventually moved on from my mum and died in a relationship with another woman. I think he was happy until getting his cancer dx. My mum remarried but has mental health needs.
My extended family is very messed up too. My brother settled down with a girl he had been with since about 14. They had two daughters. His wife became abusive and a drug addict and he left her. One of my nieces had a child early and also moved out at 16. The other slit her wrists when she was a teenager, she moved in with my brother and I believe is now settled and happy.
My brother divorced his first wife znd remarried a really nice woman who has two great adult children. He now has a mortgage, car and goes on holidays all of which he never did before. He is in contact with my mum but keeps her at arms reach. After he moved out he became a golden child and couldn't do anything wrong. My mum gave him all sorts.
I think our parents shape our lives so much and even when we don't have contact with them they still impact us. I'm close with my brother but have little to do with my nieces (the eldest who had the baby is close to my mum). I'm non contact with my mum now. After I had my children I realised I could never do what they did and couldn't understand how they treated us. My mum did all sorts as an adult too. She told me she had cancer - she didn't, often said she was suicidal if I didn't do what she wanted, lied and gas lit, admitted not loving my children as much as my brothers, said my youngest wasn't disabled (he has very severe/ complex needs, goes to a special school, high rate mobility and care dla, he'll never live independently and needs 2:1 when out). She also told me all servery disabled people should be euthanized to save money.
My children are very loved, have a stable home, my youngest has made incredible progress and accomplished things professionals said he never would. My eldest is amazing- he got into a selective grammar, is expected all 7,8 and 9's in his gcse's, he wants to go to university and is incredibly kind.
Like you we try to give our children what I didn't have. My husband like yours works hard at this too.