Avram
Define Children. Its much harder to make rules on children over 18 as you really dont have any leverage on them, they can just leave. I am guessing many people feel its better for their OTD child to be home friday night watching TV or surfing the web than hanging out on the streets and doing who knows what.
I cant speak for anyone here, but if someone threw out their OTD kid for not dressing properly, using nivel peh and being Mechalel Shabbos and eating treif and that kid went out and did Heroin and ODed and died , I dont know how many could forgive themselves