First time poster, not up on the lingo so apologies. 2dd (10&16) divorced for 3 years. Been having issues with dad since start of ‘24. He has been in a relationship with someone who has had children removed by social services (long story, she still doesn’t have them back) we went to mediation as he wouldn’t agree that she shouldn’t be near my children. Reached an uneasy truce and been okay since but she was not allowed to be present around the girls. Mediator warned him that he does breach agreement I have to pull his parental rights and he doesn’t get them back until he takes me to court. He tells me recently that they’ve split up and it would appear that he’s been hitting the dating apps hard. Last night both kids were there, youngest had a sleepover in the living room with her mate. At about 4am he has snuck a female into the house through the back door/garden (daughter and friend in next room) and she stayed the night, the eldest heard them having sex and she left through the back door his morning. Girls are with me now, but just at a loss. I feel like I need to go to court but no court can legislate to make him a decent person. We’re quite capable of organising an access plan ourselves. He just says it was a one off. Don’t know if mediation is the answer either. I’ve got my suspicions that it was the so called “ex” which opens up a whole other world of problems if he has breached our agreement. The alternative is that it’s some random he hardly knows off a dating app. Just don’t know where to go next. I don’t really want them staying over night at the moment (also fully appreciate that eldest won’t be impacted by any court order etc but even she has said now that it makes her not want to go anymore. A few weeks ago he went out to the pub with his next door neighbour and she could hear them having sex through the walls!) it feels like he still isn’t considering their welfare and if this was the other way round and it was me brining some random bloke in for sex whilst the girls were there it would 100% be considered a safety risk.