Is the husband of the sister entitled to object to her designating her mother as her attorney for inheritance, knowing that she did so willingly and believing that her mother is just?

A woman's inheritance is her exclusive right; she may dispose of it as she wishes, through donation or gift, and may appoint someone else to act on her behalf in its disposal. Her husband does not have the right to prevent her from doing so. However, it is preferable for her to consult him regarding her financial transactions, as a way of fostering affection and being mindful of his feelings.