To some extent, Aram are Mourad are foils. In literary terms, a foil is a character who provides a contrast to another character, usually the protagonist. Despite their similar backgrounds, and despite being related by blood, Aram and Mourad have notably different character traits. Aram is quite a shy young man, a bit of a dreamer who suffers from pangs of nostalgia; things were so much better when he was younger. To Aram, the world is full of romance, delightful and dreamy. He's quite naive and easily-led, which makes him the perfect foil to the wild, rebellious Mourad.
Mourad is a much more active, dynamic character than his cousin. Everyone except Aram regards him as stark, staring mad. The general consensus among the tribe is that Mourad has inherited his family's crazy streak from his Uncle Khosrove. Mourad lives up to this reputation by doing wild, crazy things such as stealing horses. Aram wouldn't dream of doing such a thing. (Though he certainly would still dream). Being so easily-led, Aram is happy to go along with Mourad's little games, but it's the forceful, active Mourad who always takes the lead.