My DH left his ex partner years ago while she was pregnant and they had small children.
With each child the ex had become more and more controlling and abusive, he had been cut off from family, he was given a huge list of DIY jobs to do on each day off and when they were not all completed he was screamed at.
He was told daily he looked funny, walked funny, dressed wrongly (this led to him not being allowed to buy clothes), he had a stupid job and did not earn enough (he was the only one working). If he had a job interview he would be kept up the night before by her picking a fight/giving a list of DIY.
He was not permitted to grieve when his father died, instead told to pull himself together and get on with the DIY.
He was not allowed to ever buy anything for himself, he once wanted a £10 DVD and many excuses were made as to why he could not buy it. When he disobeyed and left early for work to go buy it anyway, she phoned and screamed at him, you wait until you get home, you will be sorry!
He attended counselling (he felt that the problem was him) and was told that it was a particularly bad case of emotional abuse and was encouraged to leave. Luckily his mother had realised that he was being cut off from the world and had already made up the spare room so that he had somewhere to go when he was ready.
The children were all alienated from him, however years later we now have DSS living with us, he had unfortunately become the scapegoat child.