I, too, have had ongoing searches for individuals since I started 6 years ago. However, I've learned never to give up. It appears that, after a question on a marriage recently, someone in Canada has the information I have been searching for all this time - the siblings of the father of this particular bride. And it would appear that I have the information necessary to tell her why she has these details, which have perplexed her family for a couple of generations.
So the moral is, never give up folks...your time will come (thanks to RootsChatters and the bottomless fund of knowledge and information that they have!)