How do you handle dieting when cooking for the family?

I need to drop a few pounds and have come to the realization that I can’t do it just making the decision to eat healthy. In order for me to lose the weight I am going to have pick a structured diet program and follow it. My question is, how do I do that while cooking for the whole family? Do I put the family on my diet as well? Do I cook for me then cook something different for them? How have you handled having to feed the family when you are on a diet?