Amend Administration of Estates Act 1925 to include long term fostered children

My mother was fostered in 1952. She was with the same family for over thirteen years, leaving to get married. Mum never knew her birth parents. Mum cared for her foster mum in her old age and is named on her death certificate as 'daughter'. In 2025, mum's cousin died with no spouse or children. Under intestacy rules even though mum is the only surviving relative from her foster family she is not eligible to inherit anything because she was not adopted.