Re: But... how can she have children if Vision is an android?
Another alternative (not used in the comic, but science fiction writers, James Tiptree, Jr. in particular, have used it for decades) is parthogenesis, which is not supposed to be possible in mammals, but Wanda is a mutant, after all. Of course, then Vision wouldn't be the biological daddy, and Simon Williams wouldn't be able to donate, probably, because he's an energy being, but whatev.