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Thanks folks, there is a court custody hearing in 10 days and my friend has decided he doesn't rock the boat before then. He has loads of evidence that he has attempted to see them.
I had no idea how much the law seems to work more in favour of the mother in these cases. She walked out on him with no warming and would have taken her back for months before discovering she was seeing someone else.
Since then she has called the police 4 times on trumped up accusations. her 6 year old is now crying in his sleep and bed-wetting. The 15 year old is being left in charge and would move home to live with his dad in a minute but won't, because of his brother.
I don't understand why the police and Social Services believe every lie she tells them and ignores his side of the story!
Sorry, I shouldn't be venting my frustrations for him on this page - I am just so angry about the whole situation - probably because I have no children and am old enough to be his mother.
Thanks for reading this everyone. xx