I would tell your parents, but also sign up to gamstop. You say that you have been gambling, but have it under control, yet you still have been missing payments to your parents. If you gamstop for 6 months, prove to your mum that you cant gamble after this, you can at least pay her back and have a break from gambling. If you still gamble ahead of paying bills, you dont have it under control. You should only gamble with money you can afford to lose, and clearly you cant afford to lose it at the moment. I’m sorry if I sound harsh but I think this is something you should seriously consider.