Within the context of Stark family upbringing, Jon Snow grew up alongside Robb Stark, who was legally regarded as his eldest half-brother by societal standards of Winterfell, though Robb was technically his biological cousin. Following the true revelation of Jon's parentage as the legitimate son of Rhaegar Targaryen and Lyanna Stark, he does not share maternal or paternal parents with Robb, making his familial status uniquely intertwined with both the Stark and Targaryen houses.