Which Grandma?

For the past several months Aubrey has figured out her own way of distinguishing between her two sets of grandparents. She always uses the phrase "the one that has Jenna" to decipher which set we're talking about. While Calvin and I have tried calling them Grandma Wagner and Grandma Timm, it doesn't seem to click for her. We've also tried explaining that they are Calvin's mommy and my mommy, but that just seems to confuse her. So lately we just play along, because hey, it works. All she has to do is ask if they are "the ones that have Jenna" to know which ones we're talking about. It's hilarious!