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Damian and Jason are the only family members who can speak and understand Arabic perfectly
Damain's favorite activity has become speaking in Arabic what he likes about his brothers (he's trying to get better), and Jason has made it worse
Damian, in Arabic: my grandfather is right you are one of the smartest human beings of this century
Tim: ....?????
Jason: he's cursed you to the fifth generation
This has become Jason and Damian's favorite activity together
Alternatively, because they're siblings:
Damian: I hope you sit on a freshly painted bench
Jason: He says he loves you <3