He's aware of Raleigh. But as he's been... well, preoccupied, they just haven't met yet. But when he's approached by a man who could be his double, he gives him a nod of permission (of course he can sit, no reason why not) before offering a bow of his head in greeting.

"And you'd be Raleigh?"

Yes, he's Garion. Not quite literally raised in a barn but close.