1. There is nothing preventing a person, such as your sister, who holds a Power of Attorney over your mother's finances from selling her house, if this is necessary to ensure the upkeep of your mother. However, if it is not necessary, then it is an improper exercise of the POA. Either way, it does not matter what is stated in your mother's will, as a will is only operative as of the date of death and has no application before then. In all respects, it is irrelevant to the decision to be taken today as to the sale of the house, that there is a will which may at one time become operative which states that the house must be sold after death. That will has no legal impact or application until the date of death.
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