Wow!
That is gong to require a lot of therapy.
1. My first reaction was shock at the thought of a child smacking hie mother.
2. My first thought was what did she do to make him so frustrated and angry.
But the last video was more telling. When he apologized, I noticed that he apologized for making her depressed. It seems that there has never been a healthy grieving process after the death of the daughter/sister. So much blame, accusations and denial. Very Abusive.
I could see he was so frustrated at her denial or lack of recollection to his claims of abuse by her, while she seemed so calm/smug when stating that she did not recall these incidents. Also, noting that she came from an abusive family life, she needs healthy parenting skills.
I know there is such a thing as vows and judgements and she judged her family and vowed not to be like them. But she seems to have recreated the same atmosphere in her home.
They need to learn what a healthy family relationship looks like. They are both in such pain.
I pray they find the help they need to come through this before Noah gets older/bigger.