While the Bush family is crazytimes for sure, I’d like to point out that when a woman has a miscarriage at home, it’s not completely unheard of to bring the fetus to the hospital (if possible). It can help determine the cause of the miscarriage, if there’s any danger to the mother, and if there are health problems to be addressed before another attempt at pregnancy. I just got the impression that she shared with him on the way to the hospital; not that she kept some preserved fetus in a jar on her mantle. While showing it to W was maybe an overshare, especially for a teenage son, difficult and vulnerable moments like that really can strengthen any sort of relationship.
I still think the family is crazy and a perfect example of how America is broken. But I don’t think Barbara should be faulted for this particular episode.