Tristan happened to be in the woods one time when he witnessed a super-powered display from the kids of Generation X, in full uniform. Luckily, he didn't mind keeping his mouth shut about it -- after outright informing Generation X that they should be more careful. Although it seemed at times that Tristan was good for nothing other than looking handsome, charming Paige, and making Jono Starsmore a.k.a. Decibel jealous, Tristan showed a more serious side of himself when his wealthy grandfather, Hunter Brawn, got arrested for ordering the death of Mr. and Mrs. Lee, Jubilee's parents.
Hunter told his grandson not to worry, that his lawyers would get him out of this, to which Tristan solemnly replied, "No, they won't." He told his stunned grandfather that Mr. Lu (with a little convincing from a certain Ms. Lee) had confessed everything. Tristan hung up on his grandfather and walked away from the glass wall that divided the two of them. It's unknown whether the two have spoken since.