There's been hints on that Rin could be the mother of Sesshomaru's children, according to a recent poll for the upcoming series.
Did Inuyasha's Sequel Just Reveal the Mother of Sesshomaru's Children?
Did Inuyasha's big sequel, Yashahime: Princess Half-Demon, just reveal the identity of [...]comicbook.com
That's a pretty major, speculative reach.