Okay, this needs explanation. If they're fictitious, how did they drive to see you? Or is the kinship fictitious? (Like those honorary "aunts" and "cousins" that pop up in all families.) The other option is that their daughter-ness is fictitious, but my mind boggles trying to imagine that scenario, not just once, but twice.

Whoever they were, I'm glad they visited you. It sounds like a wonderful time was had by all.