Have never called her 'Sis'. Have called her 'Natures Condom Advertisement'.

https://startrek.website/post/3327326

Have never called her 'Sis'. Have called her 'Natures Condom Advertisement'. - Star Trek: Website

I say Hello Sister. I also say hello mother or father too. My family is weird though.
I do the same thing. My family’s not weird though, just me.