I would think it would be natural for kids to have questions as they get older and more aware (for lack of a better phrasing) of romantic relationships and how they work. Of course, you know exactly how to talk with your kids and, hopefully, that will help them both work through their feelings. Hang in there! You are so awesome with your kiddos!
Me 52, H53 Bomb drop 9/29/2014 Divorce from XH final 12/17/2014 Marriage #2 12/31/2019 5 adult (step)daughters (3 from XH's first marriage, 2 from current H's previous relationships) 6 grandkids