Carth whines.
Carth whines some more.
Carth whines more than any character I've ever had the displeasure of having in an RPG group.
First he trusts you, oh but wait, he has a bad past so he doesn't, then he gives you grief, then he's sorry, oh but wait, he's had a bad past so he's not sorry, then he flips out and expects you to save his evil son, then he's all weepy about it.
Give the guy a vallium or a blaster to the forehead
Also, he really wasn't that useful as an NPC.