They’re “also the problem” unless they were married to him and he had a job. Anyone who takes a chance of conceiving a child outside marriage is “also the problem.” Anyone.
Does he teach his sons his trade? Does he take them from the council estates to the dole office to help them fill out their first UB40? Does he tell them to go on the days the dust man makes his rounds because it's less crowded? Does he teach them rhyming slang and take them out on the pitch to play footie?