I have to wonder how badly it affected him when this shit went down, obviously he would have been a child at the time and it was probably fucking scarring. He likely admired his older brother and then suddenly he's gone and murdered people. I wonder if he researched his brother when he was older and could understand better, then learned about his brothers manifesto and all the crazy shit he left online.
I remember at a certain point in his manifesto he claimed he was envious of his little brother, who was 5 at the time, for having better social skills than him. He said he was planning to murder him because of that which is incredibly fucked up, but of course that was Elliot's warped mindset. Something like that would be really scary for Jazz to hear when he got older, knowing your older bro at one point plotted to kill you over being more "socially savvy"
If he ever does reach fame he'll likely have to deal with his brothers actions as a burden considering that shit would definitely get pulled up by gossip sites and stuff. "VIRGIN KILLER ELLIOT RODGERS LITTLE BROTHER IS NOW AN ACTOR"