My gran had 3 sons - A (to her first husband), B and C (to her second husband). A and B have families, C remained living at home.
Gran wanted the house shared equally but also wanted C to retain his home for the rest of his life. So she left the house to C with instructions that he was to make a will sharing it between A and B after he died.
C died without making a will. B has claimed the entire house as he's C's full brother. As C's half-brother A is apparently not legally entitled to a share.
Is there anything A can do? (full disclosure - I am A's daughter).