Archer.Todd at ic.gc.ca:
> I would say your mom has an a priori notion in her head linking indissolubly
> motherhood (i.e. the bearing and birthing of children) with proximity (i.e.
> the one who bears them ought to raise them). ...
The notion is not _a_priori_. Anyone can observe that certain kinds of relationships are needed among mammals for the nurturance of their young, and discover the reasons for them in evolutionary biology. Absent a mother, there is no guarantee that adequate substitutes can be found.
Marrying for money is a comparative long shot; only the romance of imagining future wealth is a sure thing.
Hence Mom has the better case, empirically and rationally speaking. This is assuming that everyone agrees that the young ought to be nurtured, of course.