Stop airlines from separating children and families from each other by reassigning seats to make more profits

The airlines are separating families, children, and elderly couples and other persons traveling together, from each other by reselling their seat assignments to people who are willing to pay more for a window or aisle. In once case they reseated an elderly man with Alzheimer's disease in a middle seat several rows away from his wife, and a child was seated several rows away from his parents. An alzheimer's patient seated alone could cause a dangerous situation if the patient suddenly freaks out, and a child separated from his parents and seated next to a sexual preditor is a serious concern. Preventing airlines from separating and reseating passengers without the passengers' consent needs to be added to the passengers' bill of rights to stop this increasingly frequent practice.