Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first
This is a matter which your mother needs to consider carefully.
If she does still wish you to have some claim up on her funds then there needs to be a Declaration of Trust drawn up confirming that she has an interest in your brother's property and delaing with what will happen when she dies.
Sadly you cannot forcer this
Please ask if you need further details
Obviously she can divide the proceeds of sale however she wishes