Name changed as oddly specific. For a while now, maybe the last year or two, my mother has been referring to 2 other women as "my other daughter" when speaking about them to a 3rd person (both in front of me and not). One is a former pupil of hers who lived with the family for a short while and who she has remained friends with. This woman is older than me, early 40s and my mother has seen her once or twice in the last 15 years, the last being about 4 years ago. The other is a woman who she rented a room to for a couple of years when I was a child, she would have been in her late teens at the time. This woman visits every couple of years and they speak on the phone every couple of weeks. Not sure how old she is but I'd say maybe 40ish now.
I am 30 and an only child. I find this deeply hurtful. I don't dislike either of the women she refers to as her other daughters but am not especially close to them either. AIBU?