Is moving into Mom's house to provide care the right thing to do?

My brother and his family are talking about moving into moms house to help care for her after my dads recent death. She gets confused easily and her memory isn't what it used to be and we all want to help her however we can in her day to day activities. She still drives and is very active socially. Dinners are lonely and I think she'd like more company. She has expressed wanting to give this a go on her own and I can't help thinking that my brother is pushing her to have them move in. Is this a good idea only a month after my dads death? I'm afraid shed become their permanent babysitter and would be too much change. Help!