Absolutely go to social services and have him deal with them financially. Do not in any way keep him away from the boys, who will soon enough figure him out, because (a) they need a father unless he is abusive, even a so so father, some kids can extract something good out of . if he has anger issues or physically hurts them (hitting, not something like burning etc. which would mean no contact ever) arrange for supervised visits. If he leaves, and the mother and family have taken the high road, it is sad, but perhaps something can be salvaged in later years. Both parents should have to deal with the law more than with each other in these situations and generally more support will be obtained, and more reasonable visitations. mg