I've recently been through something similar. Well not specifically me but my partner.

My partner cared for his mother for years. She had breast cancer and he quit his job, moved in with her and help care for her. (His father had dementia and lives in sheltered accomodation) any. She received the all clear.

In this period I met my partner. He was going through his own health problems so hadn't gotten a job but was hopeful.

Around this time his mother wrote a will, and it was all shared somewhat equally between her three children and her grandchildren got the house she owned.

Fast forward a few months, his mother was diagnosed with breast cancer for a second time. My partner once again put his life on hold to care for her, help her with every appointment. Meanwhile his brother had been nowhere near, and his sister visited once a week.

His mum ended up getting worse, so my partner had her go into hospital as she wasn't eating and couldn't stay awake. Thankfully the hospital allowed my partner to live in the hospital with her. Meanwhile his sister visited once a week and his brother was still nowhere near.

She ended up getting worse, and she was moved to a hospice. She was given weeks to live. My partner also lived in the hospice with her full time. He hadn't been home in weeks, I hadn't seen him nearly in a month because his sister refused to stay (she said she had to look after her 20+ year old kids at home) and his brother still hadn't visited.

During this time, his mother decided to change her will. Realising that her grandkids never visited their terminally ill grandmother in the hospital and hospice. Wrote them out and left the house to my partner. As well as 1/3 of the money.

His mother is no longer with us and his siblings have found out that my partner is getting more than them. So they're freezing him out. They've complained to him about them believing she didn't love them to try and get him to split the house and when he said no. They didn't speak a word to him at the funeral he had to plan by himself because they refused. As "mum's favourite should do it."

Sorry for the long read and thank you for anyone who managed to get through it.