3. Walter White & Walt Jr - Breaking Bad
You're a simple high school chemistry teacher. You have a simple home, but a loving wife who arranges your bacon for you on your birthday. Your son has a disability, but you make do. Then you find out you have lung cancer and you can see the inevitable spectre of death coming your way. Time is ticking.
What do you do as a father? For starters: DON'T START MAKING CRYSTAL METH. This should be no-brainer, but apparently to some internet fanatics it's not. There is just no way that will ever turn out right. At the very least, one day your family is going to meet someone (most likely at your funeral) and says "hey, so your husband/dad was a meth dealer? My daughter died because of meth. You guys suck." Then your family will have to leave town pursued by an angry mob that doesn't sympathize with the situation. They will have to try starting a new life for themselves where nobody knows of your drug-dealing, society-destroying, body-liquifying pre-death past hobby/part-time job. Instead of manufacturing crystal meth, because you haven't taken out an insurance policy, then, spend a bit more time with your family and tell them right away that you have terminal cancer - they deserve to know and can start making better preparations instead of relying on meth profits.