My son is very fat, which reasons leading to obesity?

As physical development influencing and genetical,if mother, or father having obesity, and bad meal,where eating often a sugar, potato, pies, cakes,bread, flour,cereals, carbohydrates are having, where forming a fat tissue.
And protein meal are poor eating,as meat,fish, curd, and if children to feed non right, and he can on children age and teenage getting obesity, where heart will damage, and hypertension having, and mother sometimes does not  understand,and keeping feeding a children as healthy, as better a give a meal with poor carbohydrates,as more of cabbage garnish, fish,meat, and one time for 7 days in poor obesity add reloading, as giving on this day till three glasses of sour milk, for lunch give 150 gr of curd or meat, adding gymnastic, swimming, tourist walks, volleyball,  with a doctor s control.