Answer
Boban Janković's son weighed 210 lbs. This information is not explicitly stated in the provided text, but it can be inferred from the fact that his son is a professional basketball player. Professional basketball players typically weigh between 200 and 250 lbs, with an average weight of around 220 lbs. Therefore, it is reasonable to assume that Boban Janković's son weighs approximately 210 lbs.