Is it permissible for one of the grandmother's children to dispose of her house and sell her property while she is in a state of unconsciousness and lacking mental capacity, and is the agreement of the other siblings to the sale considered a valid action or an act of disobedience?

Selling by the grandmother is not permissible as long as she has developed senility and lost discernment, rendering her actions invalid. What the grandmother owns, such as a house or other property, remains her possession and does not transfer to the heirs until after her death. Therefore, her children are not entitled to distribute her wealth during her lifetime. The sale of the house by the children is not permissible due to their lack of ownership, and it constitutes disobedience to the mother and is contrary to good morals.