I am not one to usually be sending out this type of warning on MN.....but I would tread with great care.
You love your mum.
You are close to your mother.
She has been a good mother.
She put you up whilst you were between homes.
She is staying with your brother, who must be a kind man.
She's looking for a change of scene for two weeks.
She's had a tough time.
Be very wary of not doing the RIGHT thing here.
The RIGHT thing to do is to have your mum visit and for her to be welcomed.
At 74 and unwell, who knows how many times she will visit.
You will bitterly regret not doing what you feel is right.
You will bitterly regret putting a lazy selfish CF of a partner before helping out a lovely mother.
Two weeks is nothing in the scheme of things.
If your brother is supporting her so much, I would suggest it is the least you can do.
Don't be pushed into a position that will leave you consumed by regret and upset.
This waster you have chosen is showing you who he is.
For goodness sake wake up before it's too late.