Is there some reason to not assume they’ll be cis and straight? Does this change your behavior at all toward them?

It’s not like we’re out arranging marriages or setting up our kids. They’ll figure it out on their own and teaching a cis, straight boy to play baseball is no different than teaching a cis, gay boy or a trans, straight boy or trans straight girl or any other combination. If a kid doesn’t like baseball, that just means the kid doesn’t like baseball.