If you know that a woman has hemophilia, what can you infer about her parents' genotypes?

That their parents might have had it too

Her father has to have hemophilia as well, and the mother is a carrier or also has hemophilia. So if we pretend that the hemophilia gene is x, you need to have xx to have hemophilia. The father must have the genotype Yx and the mother has the have Xx or xx.

-Arika <3