I'm going to cut ties with my sister
Do you see your sister very often?
I don't see her a lot of the time. She's close to my parents, they are nice people
Some siblings relationships can be difficult so it is understandable if you want to cut off a toxic relationship. Maybe some space and time will help the relationship get better.
Why does that matter? I'll just cut them out of my life.
If she is indeed toxic then I think it's fine to cut her out.