Mother told me everyone wants to kill themself at least once

When I was talking to my mother she was telling me how it’s a normal thing how almost everybody says at least once in their life about wanting to die and kill themself. I told her a lot of people say that or experience it yet it’s not a normal thing. She told me it’s because she was diagnosed with cancer and she’ll start drilling poop everywhere and have it all over the floor and her husband would be following behind her wiping it up off the ground. She told me she sees 3 doctors and the doctors told her it’s fine and ignored it. Yet a few years ago her son did kill himself then she started to accuse me of being like him and that I should get a doctor and move out and her reasoning is because I’m 21. I told her I’ll tell my doctor what she said and she goes “oh my gosh” as she’ll hold her hands to her head. She made false statements to the hospital when I was a child and she later on told me “ I lost my son and I was worried for you I thought I was doing good.” She’ll also tell me things like I don’t remember years ago then flip it to “I know this and don’t argue with me!” She’ll also get mad at me for saying anything to her. She’ll also tell me things like “you don’t think you need help?” Then when I asked her what about you she goes “yea I do” her husband would also tell me while pointing at me “you got into the car, we didn’t force you. Meanwhile they claimed I was 17 they didn’t have to stay with me at the hospital because some places would claim me as an adult.” It’s really starting to irritate me because anytime anyone says anything she’ll start talking loud and grin her teeth and get people involved in it and claim I’m blaming her and how she can’t handle it anymore. She even suggested we should go to family therapy together meanwhile she’ll tell me if I see a doctor that I’m 21 and that’s what the doctor would tell me meanwhile I know my age but what does that have to do with anything?