Lonely and depressed. Me a solution. tq!

Hello... I completed my PG n was searching for a job away from home. I'm elder son and  cool n silent person. I luv my family and luv 2 spend time wi them. Because of my parents medical conditions, I have to remain at home and look after them. It's been 2 years since I was at home. The problem isc hygiene and behavioral habits of my family.. They are illiterate. I have been telling them since years how to behave with others , how to keep house clean. Seriously for years. The don't listen at all.. My words can't even effect  them a bit. I lost my patience and my anger levels increased so much. Let me mention one example. In every day or two I face this. They don't flush the toilet properly. I have been telling them everyday, even though no changes in situation. I even tried to keep my house clean myself, no use. I fed up, can't eat n sleep properly. I don't want to be in this home. My parents also avoid talking with me so that they cannot listen to me. please suggest me a solution. Tq