John Diggle's father

An unnamed man is the husband of an unnamed woman, the father of John Diggle and the late Andy Diggle, and the paternal grandfather of A.J. Diggle, Sara Diggle (in the pre-Flashpoint timeline), and John Diggle, Jr. (in the post-Flashpoint timeline).

Biography
The man would take his son, John Diggle, to see Starling City Rockets games every weekend using the old subway.