Medical cause for father’s behavior? Wazifah suggestion?

My father name is Irshad Khan. He is been married for 34 years. 15 years ago he had paralysis but continue to work despite of sickness. After 15 years he again got hemorrhage this time another side got paralyzed. Now he is at home. My mother do all his things like potty bathing food and all. My father’s sisters used to come home and bring sweet dish and feed that only to my father with their hands only. Nowadays my father used to fight my mother daily and began to hurt himself and told my mother to get out. He made my mother’s life hell. But she do her fardh regularly. My father’s sisters are quite happy with that. Because from the beginning they want our house because one is widow and other did not marry live in our home. Please tell me if my father has any effect or its just sickness. Please suggest some wazifah too.