So the uncle of his that Gray referred to when saying "we all have uncles who are cops" actually could not have been the same person as Liz's uncle, could it? [detail] [discussion]
S1E11 "The Head and the Hair"
Liz: "Why do you have a picture
of my great-aunt Dolly?"
@SatyrSack ooh good research. Of course some people (like me) refer to any family member of the right age as an uncle, but it’s cool to determine all possibilities.
I did not consider that! Another possibility is that Gray's uncle and Liz's aunt (or vice versa) married each other. Meaning that not only is the cop literally the uncle to both of them, but also that their family tree had already intertwined on itself at least once before.