Family Home

My Dad is dying at the moment and he doesn’t seem to have long left. He and my Mam are married but he only has his own name on the house and won’t add my mothers name for whatever reason. He has also made no will. My mother has always been a loyal wife and devoted carer to my Dad and a great Mam to me and my brother, however there is a lot of animosity between us all at the moment. I am very concerned that my brother could force the sale of the family home out from under my mother as she wouldn’t be able to pay him his 16.5% worth of the property as she has no income and she and my father have no other assets. Is there anything that can be done other than getting Mams name added to the house to stop this from happening?