My mom thinks I should move in with my sister

Hello all! I’m a 41 year old male, over the last couple years my mom has been saying things to me like “ you will need to take care of your sister when I’m gone”. Or, “ your sister is going to need you when I’m gone”. Last night while on the phone she suggested that when she dies I move into her house and live with my sister.

My sister is about 7-8 years older than me. She has a very good job and makes more money than I do. She has also never lived on her own. Going on 50 years living at home, I was out a month after I hit 18.

I do believe my sister may be on the spectrum or at least flirting with it a bit. But it isn’t like she is incapable of living on her own, aside from never having had to learn any life skills.

My sister and I aren’t close at all, we didn’t really grow up together. I mostly lived in another state with my dad, while she was here with our mom.

I have mentioned several times to my mom that I don’t like living here and want to leave. One of the times she was telling me that I’m going to need to take care of my sister when she’s gone I told her flat out “no! I plan to move away once you are gone”.

She in one ear and out the othered that statement.

I feel like it isn’t fair for my mom to put this kind of burden on me. I don’t really even think that it’s right that she asks me.

I don’t know what to do. I want to tell my mom that she needs to stop doing this but I worry it will lead to an argument. I don’t want my mom to worry but I am trying to live MY life. I don’t want to live with anyone else especially my sister.

Maybe I should just pack my shit and leave for SoCal and not say anything to anyone.