ah that's easy. Help Thor to guard the brahminen. At the level where you guard them, there is a little plate cottage. go in there and take the radscorpion claws laying on the ground. Back in Klamath talk to the Dontans. after this talk buckrners daughter. after this talk to buckner's wife. than go to the north there is something like a stable with 2 or 3 brahminen. go there an use the binoculars mode to watch sam closer. after this go back to the buckner talk to the daughter than to the wife. Quest solved! I hope it helps!