I've tried to figure that one out for years!! When I became a step-mother, my husband pulled that crap with me, I nipped that in the bud, quick!!I had to put my foot down, and told him this a JOINT agreement and he best, contribute !!!.......He had a guilty conscience, because he was not with them all the time.He didn't want them to dislike him. ... He has come along way !!!!! He is an awesome Dad,now !!!