MIL and BIL are selling both properties and MIL buying house with BIL's family - the idea is they will take care of her in her old age so she doesn't have to go into care. MIL has early onset dementia, but personally I think she can understand the impact of what she's doing.
Nothing's set in stone, but I think she wants to put roughly half of money into the house and BIL will keep this on her death. The other half she wants to divide between her four other children now. Obviously a couple are not happy with this as they don't think their being treated fairly especially as they do help MIL with things! Putting that aside, I'm concerned about what happens if BIL is no longer in a position to look after her (he's the least healthy of all her children so you never know), or he has financial problems and house needs to be sold. Also, if she's given all her other money away, there may be very little left to help her - only one family earns above the average wage so now could be the time to pay off mortgage, have a few treats for the rest of us.
I've talked to her about this and begged her to see a solicitor before going further. I said they advise what's best for her, not anyone else, but she just said I know what I want to do and I'm not listening to a solicitor. She might never be forced into care, but me (and DH agrees) we want to know she's protected.
We can't make her take advice, but does anyone know how she'd stand worst case scenario if she needed extra care or support. Would a solicitor choose to advise her if he was concerned about the impact/implications of this, as she'll need one for the house sale.