Hi James77
Welcome to the forum.
You might want to have a look at the following FAQ which explains where everything is;
www.benefitsandwork.co.uk/guides-for-claimants/faq/forum Your question is outside the remit of the forum.
I would like to give you a straightforward answer but unfortunately I do not have enough information to do so.
I would advise you to seek information from your local Welfare Rights Organisation as they can take all your circumstances into consideration and look at options, such as treating your mum as a lodger; you can find your local Welfare Rights Organisation to help you with advice by clicking on the link below and putting in your post code, it will then come up with a MAP with a list of agencies.
advicelocal.uk Gary