Is the action of the paternal uncle and paternal cousin selling their shares in the house without the knowledge of the other heirs considered a sin? And how has Islam legislatively protected women in such cases?

An adult of sound mind is permitted to relinquish their inheritance or to donate as much of their wealth as they wish to others, unless the purpose of the donation is to deprive an heir of their right. Donations made during good health are taken from the principal capital, but if made during a life-threatening illness, they are limited to one-third of the wealth. If the transfer of ownership only occurs after the donor's death, it is considered a bequest, which is permissible as long as it is not for an heir at the time of the bequest. And if the son is the sole heir to his aunts after their brother, then what they did is permissible.