Maybe that's why, but also, since Joe Jr died in 1944 in the war, and Joe II was born in 1952 when Joe Sr was still alive, that made him Joe II.
If Joe Jr had survived the war, would Joe II have then been Joe III in 1952? I know it's a silly question for most FReepers, but it is intriguing to me.
JoeIII would have been reserved for the spawn of JoeJr.