re: Is anyone here adopted?

Years ago my sister got pregnant and put the kid up for adoption.
She was 20 and single at the time.
She never told me ( I was younger) she ever had a kid, but I knew.
Fast forward to a few years the child's wife got in touch with my sister about a family health issue. Turns out my sister's kid's kid had some medical condition that they wanted to know family history.
Nonetheless, my sister and her kid agreed to meet up. And they have been on pretty good terms since. I still can see there's a little bit of barrier of sorts between them, but overall it's good.
The irony here is that meetup with the son somehow got my sister to get together with the father of their child and they are essentially dating now after both going through divorce to previous spouses.
My sister never had another child and I really think that's been a painful decision for her that she ultimately regrets.
She turns 60 this year.