Appellate Practice Attorney serving New York, NY
Your sister can sue, because anybody can sue anybody for anything, but unless there is some relevant fact that you've omited, I don't see that she has any kind of a case. Assuming that your mother is competent and not being unduly influenced by yourand/or your husband, she can do what she wants with her money, including using it to put an addition on your house. Neither the money she spent, nor the addition to your home, are her possessions.
Executing a will means having it signed, witnessed, etc. I think you mean that you would like to abide by its terms when your mother passes, and I see no reason why you can't (although you may have to probate the will, particularly if your sister disputes any of the division of property.
Answered on Jun 16th, 2021 at 7:45 PM