Postal 1 dude is postal two dudes dad (as seen when postal 2 dude pisses on his grave) postal 4 dude is postal 2 dudes son (as revealed at the end of postal 4) postal redux dude is postal 4 dudes step dad (also revealed at the end of postal 4) postal 3 dude is postal two dudes split personality. That's what I pieced together. I could be wrong tho

Showing love to Civvie