Or accept the higher calling, and raise their family while they're young enough to have one, and get full enjoyment out of life. - My eldest son's wife learned this lesson the hard way, and had to be invitro implanted with children of another woman. She almost didn't make it at all, and went through several years of grief.
Glad to hear that all worked out well for your daughter-in-law. Everything for a time and a season.