What should I do about the younger woman my father is giving money too?

My father is 76yrs old and an alcoholic, he is married and living with my mother who is 75 yrs old. This year in February he passed out over someone's house and they called an ambulance for him. He was put in the hospital and treated for dehydration and was diagnosed with a weak heart. He was also given something to help him not go through withdrawals from alcohol. I took him home from the hospital and he stopped drinking for close to 6 months and started back where he left off. Well since then he has passed out 2 more times in the month of august alone. And each time I have to go to the emergency room to get him. I get upset that I have to get out of bed at 3am to pick him up from the hospital when it is his fault for drinking. It seems the passing out only happens when he goes over the neighbors house. The neighbor has a 35 yr old daughter that has been getting money from my father when he is drunk. He doesn't realize how much he has given her because he was drunk. When he gets sober he realizes his money isn't in the checking account. This is the 2nd time it has happened. My mom has told the 35 yr old woman not to call her home. But the woman does it anyway. I have asked my father to stop the shenanigans to no avail. As a matter of fact, she just moved down the street from my parents. I am the only child, I am 50 yrs old and I am in the middle of a mess. I feel that I am responsible for them both. I believe my father thinks this 35 yr old woman is attracted to him, when all she wants is his money. I want to help my mother have a happy retirement and not go through this crap with this trash. This woman has children and a boyfriend. Lately, it seems my father is having problems with his checking account and paying their bills. Truly, the only reason I am involved in my parents business is because when anything happens to them, they call me. There is no one else to call.This outsider is making my life a living hell !!! I mean it was already bad enough with my father getting drunk everyday at home. But now he is being taken over other people houses, giving away money and passing out. He doesn't remember what happened because he was drunk. I mean, staggering can't walk drunk. Now he is accusing my mom and I of getting his money and we don't have access to his accounts. I don't know what to do?