Thank you for your question
My name is ***** ***** I shall do my best to help you
In fact the proceeds of sale are split as to on third to your brother and two thirds to your mother.
Your mother will then have to use the funds to pay fully for her Care until her capital drops to £23,000
I hope that this is of assistance - please ask if you need further details
No your brother cannot take it all - it has to be split and yes the balance if any is split in accordance with the terms of the Will.
The position does not change for your brother no matter how long the sale takes
No your brother's share will always be taken into account when the value of the property is calculated