Just that - and it's not something that bothers me.
But am curious about it.
My parents were both 1930's babies and, as a child, I was told "That woman is your mothers mother and your mothers father died many years ago. That there is your mothers elder sister and therefore your aunt. That is your aunts child and therefore one of your cousins".
I did wonder why my mothers "brothers and sisters" were all pretty much similar ages to each other and then there was a big gap (17 years) between my mothers "elder sister" and her. I did wonder why my "cousin" (ie a daughter of my "aunt") was so much older than me. So quite a bit of wondering - but just accepted what I'd been told by my mother. My mother wasn't the sort of person one could talk to very much - she was very reserved/private/etc. My father was a very different temperament and much more open etc - but he would have said the same as my mother did and I only ever got a couple of clues from his direction - but he didn't tell me how things had been.
It was only pretty recently that someone I knew looked at the family photo album my mother had given me and, when she came to the photo of my mother, her "elder sister", a couple of her "elder brothers", my "grandmother" that they took a close look at it. Then they said "Did you realise that in that generation there were a noticeable number of illegitimate children born and sometimes they were brought up in that family and their grandmother acted like their mother?"
The second she said that to me - I took a good look at the photo too and I could See It and I knew she was right in what she'd spotted and I hadn't been "told it like it is". I could see that "Aunty P" was looking at my mother as she would view a daughter and not as one would view a younger sister, etc, etc. "Gran" was not looking in the slightest like a gran and was clearly two generations older than my mother. I had also wondered why my "Gran" (as I'd been told) had had her last child (my mother) so late on (ie nearly 50).
So I can see it now and I'm not bothered. Just thinking that that certainly explains a few things.
Admits to wondering when I send my annual Christmas card to my "cousin" whether I should make some sort of (jokey) comment addressing her as "Aunt her-name". We don't really know each other - I was a bridesmaid of hers when I was a little tot, have only met her a few times over the years and knew she was a favourite of my mothers - and accordingly sent her one of my mothers rings as a keepsake when my mother died (which she seemed to be very pleased with). My "cousin" (now aunt it seems) isn't anyone's idea of prudish I gather and hence me always very surprised how my reserved mother obviously liked her - as I'd got the impression my "cousin" would make a vicar blush LOL.
Wonders if I should just leave it and think "Well I was lied to for years - but I guess it doesn't impact me afaik. Might as well just keep addressing those Christmas cards to "cousin"/aunt as her first name/married surname and leave it at that. My suspicion is that my "cousin"/aunt probably knows or has figured it out herself.....