Who lives in the master bedroom, parents or sons and daughters-in-law?

Parents should live in the master bedroom. Because most of the master bedrooms are facing the sun, the elderly live warm and meet their physiological needs. On the other hand, most master bedrooms have bathrooms. Is it convenient for the elderly to get up more at night? From the respect for the elderly, the elders are in the south and the younger generation is in the north, so the arrangement of the house should be that the master bedroom is reserved for parents.