I feel uneasy about this, but need some advice.
Me sister owns her own house (due to getting it in divorce).
I was a single mother, when I met DH I moved into his house (housing association, his ex wife was on the tenancy, but now it is in his sole name, not sure how that affects things, but leaves me feeling vulnerable).
My parents have mirror wills. They have a house worth between 350 - 700k. The wide price range is due to the fact that it is two houses, but hasn't been properly separated (there is still an internal door into each 'house'. Not sure how much it would be to properly separate. The property comes with an astonishing amount of land though, right in the middle of town, so they have been offered lots of money from builders/developers over the years.
Originally the will was to split the property between me and my two siblings, with Dbro allowed to live there. He died in 2020, and has no dependants.
Dad died in 2021. The will is such, that mum is allowed to live there for the rest of her life, but dad's share was left to my sister and I. Mum's will go to us on her death (hopefully a long time away, but she is nearly 81).
If mum wants to sell up she can, but we get our share immediately.
My Dsis has decided she wants a much bigger house. She has suggested that she sells her house and mum sells hers. That I get my share and mum and Dsis pool theirs and buy a property for 900k.
Mum told me this to 'reassure' me she won't do this, but Dsis is really pushing. Dsis thinks this is a great deal for me too, but actually it isn't.
Here's the problem - if this did happen, then surely Dsis would then need to give me half of mum's share - maybe even sell her house to give me this.
Dsis has spoken to her friends, who have told her that if mum does this, then it would be that mum 'gifted' her her share, and I would be wouldn't be able to claim anything.
I should also add that mum is still there, though Dsis has been insisting for years that mum has memory problems (she thinks dementia, I don't). So I'm not sure if she gets mum to do this (which mum doesn't want to right now), whether it would stand.
I should add that if anything happened to Dsis or I before mum, then our share would fall to our children. This is repeated in mum's will.
Mum has told me not to say anything, but I'm not sure what to do with this information, as it has unsettled me.