OK. I see where you're coming from. Your reasons for wanting to stay in the house after your mum dies are understandable, but unlikely to cut any ice with the Council or Housing Association. Unfortunately, Council and Housing Association properties are reserved solely for people in housing need, and sentiment doens't come into it at all. I'm sure the COuncil won't have a problem with your going to live with your mum. As a single(?) person with no dependents(?), you are not likely to be allowed to go on the tenancy. You would not be considered vulnerable, nor in need and the Council will have serious issues with you succeeding to the tenancy when your mum dies. Even more so, you would be one person, without dependents, living in (I assume) a house with more than one bedroom. That's always a no-no for a single person. I know your mum has been living there alone for some time, but that's probably because no-one's actually put two and two together. the house is actually statutarily too big for her. You don't get the privilege of spare rooms in Council accommodation and it is likely in the fiullness of time that someone would have caught up with her and offered her smaller accommodation. Even if you were granted a joint tenancy over the period of her illness, you would not be allowed to say there after her death and, if you are single and with noo dependents and not vulnerable, the council has no obligation to re-house you. I'm really sorry to be the harbinger of doom at what is a rotten time for you. My advice is to have a word with mum's housing officer. they'll tell you the best options. No-one will throw your mum out, I promise, she's vulnerable, because of her illness, so don't worry about that! Good luck!