I think I saw a theory like that about Rarity and Sweetie Belle too (we're talking about "is actually mother but claims to be sister" right?)
And yeah, its hard for a girl to impregnate a girl... but then again, these ponies do impossible things at least sixty times a day, so hey, what's one more? Also headcanon: There's a
Cursed Springs of Jusenkyo in Equestria, except the only springs it has are "drowned man" and "drowned woman" and
everypony has fallen into one or the other. There's the explanation for gender-flips, guys.
Anyway, it would be interesting to know if anypony has children we don't know about. Twilight Sparkle especially (the struggles of studentship
and motherhood!) Although, it would be strange if Pinkie Pie had children... borderline wrong, actually.
EDIT: Ugh, silly me. Of course Twilight Sparkle has a child. Just he happens to be a dragon.
edited 4th Jul '12 3:55:01 AM by MoeDantes