question for the electricians

thanks for all the help guys

(i should have started with this, but here is the junction box)

it looks like the bottom two cords were actually one, at some point (based on the red wire)


could i just add a white and a black to each of the two wirenuts?
(and would that work with a GFCI)

oh, and im not sure on the size of the wires, i was just guessing at it, so if it should be 12 or 14, it probably is