Feel bad for the kid. Shitty dad will come around on occasion to stake his claim. Mom will be delusional and blow up good relationships because she will think this will be the time shitty dad will be the good man and father he's supposed to be. Shitty dad will bounce when he's bored.... cycle continues.
Meanwhile, kid is confused as to why shitty dad never stays around and the cool dudes always seem to disappear.