I am not really in agreeance that genetics play a huge part tbh. I think if you don't exercise and eat healthy then there is a big chance of becoming overweight and a majority are overweight due to lack of excercise and unhealthy diets so if a parent is overweight then a child has the potential to be as well. My brothers 3 kids are all overweight and I see the crap they are fed so it's no wonder. Dh and i are very active, we exercise and eat healthy and our kids are brought up that way too. They are not given sugary foods or fatty foods. Kids will learn from their parents.