Apologies for the slow reply, I went out yesterday
The fact he wrecked their room will put a different slant on how things are portrayed here :)
Then I would expect to have CAF involved myself. They are an excellent service provided for children and their rights. You can involve them yourself if you like. They are NOT social services so don't be afraid to contact them (not that you should be even if it was a dept of SS)
http://www.education....68957/the-caf-process
It is unlikely the children will be heard in court as Caf will do that process for them
It is difficult sometimes, as Eddie shows, to differentiate between what the father has done and his seeing the children. If there is a credible threat of abuse of any type, then contact centres are there for that purpose. To enable the children contact with their father. It's my long held belief that some contact, even with a father how isn't very good, is better than none at all, and whilst it is anecdotal, any evidence I have can be seen everyday in my job
Sometimes, it can appear that the justice system fails, and certainly sometimes it really does, but involving outside agencies is your only option here. No judge in his right mind would believe one parent over another - any who do are mad IMO!
My advice to you would be call your local council's children's services dept and go from there. My council has an excellent web site detailing every service available for children and adults alike inc things such as your situation. Check yours out
Good Luck