Question
If the father is unable to care for himself, and all his children are married, is it permissible according to Sharia for the siblings to divide the shifts in caring for the father, with the daughters providing care during the day and the sons providing care and sleeping at night?
Answer
I say, and with God's help: Caring for the father is obligatory, and they must do so in a manner they see fit, including what you mentioned in your way, and God knows best.