Mom was Rh-negative, I was Rh-positive and the third (and last) child, born in 1963. It used to be a big deal, since antibodies in the mother’s blood attacked what it viewed as an invader.
Six weeks premature, four total blood replacements (not transfusions, replacements), NICU for a month. Catholic, so I was baptized and given Extreme Unction (aka Last Rites) so my soul wouldn’t be trapped in Limbo.
So I got that going for me, which is nice.
P