Perhaps your husband (fiance) would prefer to read the information in a book. Order Mark's book The Primal Blueprint and ask your husband if he would like to take a look at it. Tell him you would like his opinion on it, and then don't nag him about any of the primal information. That's what I did with my husband. He would rather read a book than a blog. Besides it is much easier to absorb the information and flip back and re-read sections. My husband calls Mark 'that caveman guy' but he at least has some understanding of what I am doing, and as long as the food I cook tastes good, he'll eat it. If he wants to eat grain crackers, or cereal, that's up to him. I don't buy bread-- we both realize our bodies have problems with carbs. He'll eat bread at restaurants though. I don't say anything. His diet is up to him.
As for the kids -- that's a tough one. My kids are grown and gone, although I gave my son Mark's book and he loved it. He's cooking primal for himself, walking, lifting heavy things, and is healthier than he's been in a long time. For younger kids though, until your husband is on board, you'll just have to make good tasting primal food, and keep offering it. Even before I was primal, I cooked many things from scratch with healthy ingredients (although we were still eating grains). At the time, my kids were so picky if you named a food I would be able to tell you which member of the family wouldn't eat it! Now that they are grown they eat so many more foods AND some of the healthy stuff I cooked that they wouldn't eat years ago, they now cook for themselves because it reminds them of home and growing up and they eat it (SHOCK)! Anyway -- just wanted to give you some hope. Set a good example and fix healthy food for yourself, while you may have to continue to cook their food, keep the nagging to a minimum and after a few months you may be surprised at how much healthier your family meals will become!
"I don't know the key to success, but the key to failure is trying to please everybody."