Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first.
Did he confirm his offer to share half with you in writing?
When did your mother die?
What was the original discount she obtained
Was there any mortgage outstanding?
I take it no one has applied for Letters of Administration of her estate?
No - that ended when your mother died - this would be about trying to deal with her Will/Estate?
He has no reason for worry.
It is clear that your mother had a clear financial claim on the property and that she understood that she was able to dispose of her share as she wished AND that your brother was aware of it.
On that basis the Estate could make a claim against the proceeds of sale - and the executor shoudl write a clear letter indicating that unless the offer to divide 50% of the equity between the other siblings then a Court Applictaion could follow.
It would not be the easiest of applications - but it could be successful - but only the Administrator of her Estate can deal with it
Please ask if you need further details
He would have to make an application under the Trusts of Land and Appointment of Trustees Act
It would be best if he got some face to face advice from a local solicitor who can review the paperwork.
Alternatively he could ask a Direct Access Barrister to prepare the claim