The hearing it from hubby's side thing would worry me the most to be honest. No child needs to grow up worrying about weight and body shape, so I'd be asking that none of them discuss it around hey and try to instill positive self-worth and body image instead.

I get the genetic thing. My Nana has always been overweight, from babyhood to now. So has my Dad, but my Uncle wasn't. But I do believe lifestyle can overcome it, and something small like a change from full-fat to low-fat milk wouldn't have made a big difference