Who is Our Grandpa?

Riley has been learning about geneaology today.  She was curious as to who her Grandparents are and who mine are and who Jeremy's are.  So I explained to her that when she has kids, I will be her kids' Grandma.  She thought that was pretty funny.  So she shared some information about it with Jeremy.

R:  Oh Dad.  You know what?  When I have kids, Mommy is going to be their Grandma!  Isn't that funny?
J:  You know what that makes me?
R:  No - what?
J:  Grandpa!!
R:  (laughs) that's funny.  And they're going to ask 'Who's their Grandpa?'  And I'll have to tell them 'You Are!"