You're right about Gaelen and Nelwyn. Actually, they have very little kin left in Alterra other than rather distant relations. They are like 'partners' on cop shows, also. They have been patrolling the Greatwood together for hundreds of years--depending on and helping each other, relying on each other for company, all of the above. Hunter-scouts are like the equivalent of a terrestrial Coast Guard.
They socialize with others, of course, but when they are 'deployed' they might be out in the forest for weeks at a time.
No wonder Gaelen is so 'feral'.

It might interest you to know that Gorgon is my absolute favorite character. He is so deliciously complex!
Just wait'll you get to Ravenshade! It's Gorgon's book.