As someone who has been through the Right to Buy i can tell you, you can. If the tenency is a secure tenency which it sounds like it is, you could succeed to the tenency if you spent 12 months living with your parents prior to buying. This is easy to do even if you dont actually move in. For example, all they ask for is letters at that address in your name, for the last 12 months. The amount of discount has now been capped, so it depends where you live as to how much you get. The best thing to do is call your local council and ask them for advice, they are usually quite helpful. If not try their website, where it will probably have a policies page detailing how they work. Their address will be www.yourcouncil.gov.uk Then go to an independent financial advisor for advice on the best way to purchase. If you use the company that always advertises on T.V for the Right to Buy be aware of the fees as they are very high.You can legally succeed to the tenency.