My boyfriend’s mum

Hey I need to get this off my chest, so since me and my bf had our son his mum has hardly been involved with him and hardly ever speaks to him or gives him any attention whenever she sees him but she treats her granddaughter completely different like she does everything for her and always gives her attention she treats her like she’s her own child which I think is completely out of order! My son hardly knows his own nan and he’s 1 now! He’s scared of her! So that’s one thing I am not happy with the other thing is that me and my bf unfortunately had a car accident a week ago and my son got injured as he bit his tongue quite badly during the accident but he is healing really well, my bf’s mum wasn’t concerned at all she just complained about taking us to the hospital as we had no transport anymore when her grandson was injured and in a lot of pain! Then after we all got checked out at the hospital we needed to be picked up to go back to my bf’s mums and she refused! My bf had to ask his brother to help instead which he did, the reason why me, my bf and son are having to stay at his mums is because as we have no transport anymore because of the crash we are unable to get back home which is really really far out and it’s in the middle of nowhere so I won’t be able to live there anymore without transport as there are no shops or anything to live with there, me and my son will never be able to see our family as they don’t have transport either and buses hardly ever run, my bf’s mum knows about all this but she still won’t let us stay until we can get rehoused, my bf has offered her money for us to stay temporarily but she still won’t! Me and my bf both think she is being out of order as she had enough room for us and she would be getting money for us living there but she doesn’t care! She still won’t help us! Sorry for the long post but I had to let it out, me and my bf have been getting very stressed and worried about our situation, we don’t know what to do, what do you all think? Is my bf’s mum being unfair or are we asking for too much?