Is there a way to find out BMI for children?

My son is almost 9, is around 4'10" +/- and weighs over 130 lbs. I am upset that he is so big and it is hard for me to judge his size since I myself am morbidly obese (and hoping to have surgery) and basically all his immediate family is obese to some extent. The BMI calculator says he is overweight, but I know he is obese for a child his age. I can't even go into a store and buy him a pair of jeans without having to go to the 18 husky, then have to have them altered to fit his height because they are nearly 6" too long! I want him to loose weight and try to inform him that he doesn't really want to be like his GrandDad and everyone else in the family because it will cause problems as a child growing up big (thanks to many wonderful childish pranks) and the possibilities of medical problems as a young person to even early adulthood! I am hoping that if I get a chance to have surgery and alter my lifestyle that he will follow, but I am not sure that will happen. Is there any way to find out his "TRUE" BMI for his age at the weight and height he is...and if possible...would he be considered a candidate for the banding procedure?

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