I'll never understand this kind of stuff. I have a brother who introduced himself to my friends as my half-brother. I gasped and asked him which half was missing. He never said it again.
Well, it’s half because we share the same father, but we weren’t raised together (she is 12 years older than me), so it’s hard to consider her a full-fledged sibling. She grew up in CA and detested being forced by her mother as a teenager to come here to TN for the summer where she had no friends, no car and nowhere to go (though in hindsight, I absolutely sympathize with her misery when she was here, and eventually she refused to come here altogether - she last came with her late mother about 27 years ago). I haven’t seen her since her wedding over 18 years ago. It’s her choice, she could come if she wanted to, I just find it astonishing she hasn’t.