Long story short, FIL was diagnosed with dementia in 2018. He & MIL moved into a static caravan on their land and let BIL move into their house. They refused to sign house over to him because he's notoriously bad with debt, been bankrupt before, has addiction issues. They said the house will become his when they both died.
FIL died 12 months ago. MIL was still living in the static caravan, BIL still in the house.
Fast forward to yesterday and BIL took his own life. We've found out today that FIL signed the house over to BIL in 2020 (2 years after being diagnosed with dementia. MIL had no idea) If I'm being honest, BIL was a selfish, dodgy person and probably coerced FIL into doing this secretly.
The worry is now that BIL's 2 children will inherit the house (there was no will) and MIL is now going to be left with nothing and homeless.
Is there anything MIL can do? Will it stand up in court if she fights this because FIL had dementia at the time of signing everything over?