Dear Cali Chica:

So  you will be telling your sister that you don’t have contact with N, that N is no longer your friend and therefore your sister’s relationship with N is her business, not yours, and you are not interested in hearing about N anymore. Correct?

Same if your sister mentions your mother: you are no longer in a relationship with her, your sister’s relationship with her mother is not your business and you are not interested in hearing about her mother, did  I understand correctly?

And then, if your sister does not respect your wish to not hear from her about N or about her mother, then it is a problem you have with your sister, her not respecting your assertion…?

anita