He is in care,l have sighted the old will years ago. It was a simple 50/50 split. I believe a new will has been done, just need a copy.
Gary,
You did not answer my questions.
All beliefs are falsifiable.
If you think there is a new will, and you may need to challenge that will, it will be based on the claim of testator lacking capacity to instruct a will.
If that is the case, you will need to identify when the testator was diagnosed with dementia, and what stage he was at when diagnosed.
if there an older will, and you know who was instructed to draft it, you may want to contact that person and obtain either a copy, or an affidavit about the instruction and execution of the older will.
I gather the relationship with the appointed executor is not great?
Ask your sister why she is refusing to give you a copy.
Explain to her that she does not want to engage in a challenged probate.
However, I do not know the circumstances.