The question is when it is permissible to sever or alter these relationships. Catholics might say that divorce is impermissible because the husband/wife relations is sanctified by god and is permanent. They might say that god never makes mistakes mismatching the soul (self) with the body. They might say that god blessed the woman with a relation with her fetus.

For those living back here in reality, there is no god setting up these relationships with a grand plan. We are the collective authors of our future, and it's up to us through conversation and education to decided what kind of world we want to build. Maybe we'll decide that the old ways are good, and maybe we'll decide that they're not.

Ultimately, the choice is up to us.