Back to the Hal having a son thing, and keeping with the Goku similarities.....
I can see Hal's son being a lot like Gohan. I mean, it would make sense for Carol to be like Chi-Chi, and ensure their son not be a hard-traveling, cosmic hero.
I can see Hal trying to sneak his son out for a little cosmic adventure (after homework), and Carol having none of that. I can see Carol wanting their son to be anchored & Earth-bound, with Hal understanding, but also being frustrated by it at times.
I can see Hal's son not be a high-flying, seat of their pants adventurer, but still brave & heroic.
That would be a fun set-up, hopefully without the need for plot induced drama.
On a side note, I can also see John Stewart being a Piccolo styled-mentor to Hal's son.
I like Porter a lot. Would love to see him do an arc on HJ.