"My sister lives there, with her partner and son, though she lives in the south. We did take a trip up to the Redwoods when she was stationed near San Francisco though."

He turns to Jyn. "Since you cannot remember the trees, maybe one day we can meet up with Shara there."

It's half teasing like the rest of them are teasing, but it's also a side comment about... bringing all of their families together, one day. It doesn't have to be California. But he likes the idea of it somewhere.