Quest Problem *Spoilers*

[copycat]

i think u just had bad luck. u can complete the quest killing the frogs and then talk with doyle, but u have to do that before telling clay maybe that he has parents. clay goes killing his dad after he hears that his fahter still lives, vengeance for the abadonning and his bad child hood under the priest.

i think it's a bug, the quest should be closed instead being an lose end.