mizo1010 welcome. We all draw the line with our alcoholic parents. Some completely cut off contact and others have limited contact. You have to find what makes sense for you. It's hard when they are elderly. You're fed up and then at the same time, how can you just let go, then society wonders why you are not taking care of your parent. My mom was the enabler and beater plus being a hypochondriac who lived to 97. Once when she was about 93 she was in the hospital for a week with no results. The nurse called me and yelled at me about not one of her six children visiting her and shame on me. Ugh. We made sure she lived in a nice place and had some services but we didn't play her games anymore.
You have to find your peace. Hopefully reading here and maybe attending some meetings will help you find it.