What do you do when a sibling insists on your not ever writing about your family?

[pnwmom]

I'm not writing a memoir; I'm writing a children's novel with a gay dad, so it is relevant that my own parents were in a mixed-orientation marriage. Today my sister told me if I ever mention our dad being gay to anyone from our hometown, even on Facebook, I will purposely be ripping off her scab and making her bleed. (I guess she's talking about the parental-divorce-scab, when she was 23.)

I told her that most friends in that town already know about our parents, and don't care. She said that doesn't matter. She doesn't want anyone to have any reason to think about our dad being gay ever again.

I hung up while she was yelling at me, for the second time, that if I ever outed our family on FB, that would be the end of our relationship.

We have different last names, live in different time zones, and have 95% different friends. Doesn't matter. If I ever go public about having a gay father, that will be the end of our relationship, or so she says.

P.S. I have people I'm close to that have serious health issues, and it is scary to think about losing them someday. I didn't need this threat from my sister, on top of everything else.