I am having a discussion re. surrogacy - gay couple, one of the guy's sister has offered (after initially saying no way) to carry the baby for them. It's not clear to me if she is also donating the egg too or not. Either way, in my eyes, she is the (biological) mother.
This woman is arguing that the sister will not be the mother, and thinks she should be called aunt.
I am aware, of course, that being a mother is much more than giving birth, and that you can also be a mother without giving birth. But this woman's attitude is almost like the birthing mother does not exist, and should not even be named, which I find very dehumanizing.