Mother has middle stages of Alzheimer's and her table manners and social skills have disappeared. She chews with her mouth open, smacks her lips and belches loudly. She takes her napkin and blows her nose, putting it back on the table, even in restaurants. Family meals are no longer enjoyable. No amount of prompting or scolding makes a difference. When caught she claims she did not know she was doing it or says sorry, but it continues at every meal. Any suggestions?