My Elderly 86 Year Old Father Is Detererating Wonder If

My elderly 86 year old father is detererating wonder if it parkensons start thing noticing memory losing it extreme shakes when I am there he seems calmer hearing my mother upstairs talking to him see has been gone seven years suddenly falling balance bad memory going back in time simple thing like remote which he used everyday now is so challenging what do you think he also has extreme aniety problems I really need answers to be able to help him