My husband could stand to lose 30 pounds. Actually he REALLY needs to lose 30 pounds, but he has been 30 pounds overweight for the last 20 years. I have been anywhere from 0 to 190 pounds overweight and everywhere in between...lol Sometimes he says he would like to lose it, and he'll try to give up his beloved chips and beer for awhile, but it never lasts. I'll get a little pissy with him when he brings home 3-4 bags of chip in one day but it's useless.
What I do is I cook for the family. I make us all the same thing. They serve themselves. If they don't like it they can fry themselves an egg. If they complain, (which they rarely do), they can do the cooking.
Over the years several people have said they wanted to "diet" with me. I tell them right off that I will not be the food police. I will make suggestions and give them pointers if they ask, but I can't do it for them. Several of my fat friends have "left" me because of my weight loss. It sucks, but I'm not going to stop trying to be healthy to please them.