How do you define a terrible dad? This is how I would define a terrible dad: the dad whose firstborn son was born pulseless and apneic, basically stillborn, but the dad himself assisted in bringing him back, so that he is alive to this day; then that dad, knowing how precious above any jewel every second that he gets to spend with that child is, has the audacity to look that beautiful child in the eyes and say, "No, buddy, I already gave you loves tonight and you really need to go to sleep." THAT is a terrible dad.