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Thanks themas - you've given us a few options not considered so far.
To answer your questions, Gran's will splits her estate three ways - mum and 2 siblings. But since moving in, mum has spent nearly 30,000 on improvements and this has complicated it! Gran wants to leave slightly more to mum as she is 24 hour carer at the mo, which is fair enough. One sibling agrees, one doesn't.
P of A has yet to be sorted out, but Gran doesn't want to talk about it. She's a very stubborn old lady and when lucid, is dismissive of the whole idea. As a result, she still has control of her own affairs.
Buying the new house doesn't depend on the sale of Gran's, no. The idea of selling up totally is, as far as we can gather, so that Gran can go too, and have the money for the necessary healthcare. It's ridiculous - neither of them is so wealthy they can afford care for an indeterminate number of years. They could have a very comfortable retirement in this country, but in the US they'd be paying unnecessarily huge amounts.
None of it makes sense, and it's causing a lot of heartache. Mr nutgone and his mum have had another upset this afternoon. One sibling has been around there and actually been allowed in today, but we're waiting for news on that score!! It's all awful, but at least it makes me glad that MY side of the family is more normal!
Thanks again x