Is a married son who has no income and supports five children obligated to send a daily lunch meal to his well-off father who is able to buy his own food? Is it permissible to force his wife to prepare this food, and what is the wife's position in this situation?

It is not obligatory for a wealthy son to spend on his wealthy father, nor is it obligatory for the wife to serve her husband's father except voluntarily. If the husband's father is rich, the son is not obliged to send him food, and the wife is not obliged to prepare it for him.

The wife does not have the right to object to the husband spending on his wealthy father; rather, she should encourage him to honor his father. The wife can gently and wisely advise her husband to balance spending on his wealthy father with saving money for his home and children, and to seek a means of earning lawful money.