Buying and selling a property whilst claiming ESA, do deeds have to be in ESA claimants name?

My mother is of ill-health and struggling to pay her mortgage, she is currently claiming PIP and ESA (income related). I would like to support my mother with day-to-day living and her financial worries but I live 90 miles away from her so it is very difficult for me to help. Me and my mother have discussed this in detail and she feels that it would increase her quality of life if she moved in with us so we can support with day-to-day living and she does not have the worry of paying her mortgage anymore. However, me and my partner would also need to move out of our current property as we currently live in a rented accommodation which is too small to accommodate my mother. So we agreed our best option would be to buy a house together so that she still had a secure home but myself and my partner would take on the mortgage so she wouldn’t have the worry of a mortgage anymore. My mother would sell her house and clear her existing mortgage put her equity into a new home for us all to live in. Myself and my partner would take out a mortgage to cover the remaining balance on the new property. The new house would have to be designed specially to suit my mother’s needs.  

From what I understand, if myself and partner are taking out the mortgage then the house must be solely in our names for the security of the mortgage, which is no problem for any of us as it removes the debt from my mother and myself and my partner are happy to cover the mortgage, it secures a home for us too. However upon doing some research I am unsure whether doing this will affect my mother’s ESA claim. Unfortunately me and my partner would not be able to provide my mother with an income if her ESA benefit was stopped. I have read that she is able to sell her property and buy another which will not affect her ESA but what doesn’t appear to be clear is whether the deeds for the new house have to remain in her name as this would then mean that me and my partner cannot secure a mortgage.  

 Me and my mother have been researching this for a few weeks now but still can’t find the answer. My mother visited Citizen Advice Bureaux to get some advice but they were unable to help. We have tried seeking advice from solicitors but none appear to specialise in this area.  

 I would really like to be able to care for my mother for a long as possible. I worry that if we don’t move closer together then I will have to rely on carers to look after her and I really would like to look after her myself.     

Can anyone advise who or where we can go to find out more advice on this? We just want to know where we stand so we can consider all our options.