A friend of mine has received ~$250,000 over the years from his sister. He has never asked her for money, but he has been ill and Canada does not recognize Lyme's Disease as a disability for him to receive benefits. His sister offered to help him out.
Now there has been a falling out, and the sister is asking for the money back. There was no written agreement for repayment, and it was understood that this was a gift of one family member helping another.
Does the sister have any legal means to take this money back?