Posting for a friend.
She was hospitalized for a few months with a mental breakdown. This was brought on in part by finding out her partner had been cheating. They have small kids together (under 9 yo).
During the hospitalization her partner (now ex) looked after the children. Social services were involved but didn't open a case, they were quite happy that the kids were being looked after and then they were to make their own arrangements between themselves.
He has moved their children out of their family house and into a new rented house, changed everything over to himself (benefits and doctors etc). He didn't tell her this.
He's also bringing in new girlfriends here and there which is upsetting them, he won't speak to her directly and she has to ask to see the kids via his parents. She's really distressed and the kids want to go home but he won't discuss it.
I've advised her to make initial contact via letter but what else should she do here? Surely he can't do this?