Is it permissible for a son to dispose of the remaining salary of his bedridden mother who is not cognizant, by spending it on his household and giving charity from it on her behalf and on behalf of his father? And is his wife entitled to demand a share of this salary in return for her service to her husband's mother?

Dementia is a brain disorder that affects daily activities. The ruling on dementia in Islamic law is the same as the ruling on a mad person. A person with dementia is interdicted from managing their wealth, meaning they are prevented from disposing of it. The guardian must not dispose of the interdicted person's wealth except in a way that benefits them. It is obligatory to spend on the interdicted person appropriately, without extravagance or stinginess. It is permissible to spend from the demented mother's pension for her food, medicine, and diapers. It is not permissible for the children to take any of her money for themselves. However, it is permissible to hire someone to serve her from her own money. A son's service to his parent is obligatory upon him, and he is not permitted to take a wage for it. As for the wife or the brother's wife, they are permitted to receive a wage for serving the mother. Any surplus of her wealth after her expenses and service remains hers, and then becomes an inheritance after her death. Whatever was taken from her money unjustly must be returned.