Can a person change there mind after signing a quitclaim deed?

my sister set up a quitclaim deed in 1986 so when my mom passes her house will be sold and the money divided up amoung us 4 kids, my wife and i took care of her for quite a while before she had to go to a nursing home , now she wants me and my wife to have the house and property....can she change her mind ?
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