Nodding since Troy did verify that it probably wouldn't normally be lonely since everyone there had the same life span, Clara listened to the rest of the story, smiling some as he mentioned the whole stealing a... TARDIS or whatever he called it. Of course Troy would steal something to go explore.
"Sounds like something the two of us would do given the chance."
The idea of him having a granddaughter was very hard to picture, just because Troy was Troy. Which tended to be her definition of her family by repeating their name. There was no singular way to describe them. Though she supposed anything was possible. And him being older and still stealing things like a TARDIS was pretty much her cousin, or the side Clara saw more often as she well knew she was the one who tended to get that side out of him as opposed to Troy deciding to stay in and read.
Resting her head on the back cushion of the couch, Clara watched Troy, pursing her lips together in thought. She really didn't have an idea on how to expound upon it. But she knew he could since his mind was set on it.