I'm going to suggest overweight family make healthier choices
Why would you even bring that up with them?
My thoughts are that it's healthier for overweight people to take up healthier habits.
I get that your intentions here are good, but it it the way that you are going about it. It is hurtful to bring it up like that, some people really struggle with their weight.
I don't deserve this attitude. I'm trying to fix unhealthy behavior.
Some people need to come to their own conclusions first, they could feel slighted if you come to them first. Wait for them to ask.