I believe that Sarah was a second wife to Conrad becasue of the older children Conrad had.Sarah's birth may make her too young to be the mother of his oldest son.Not sure. It's not impossible for her to be the mother.
Like you, I still have been searching all these years to find Conrad's family.I have seen the links between Henry and Conrad.There are land records that connect them too.
Funny that there is nothing that I can find on any of them.Dr. William Adams also lived in the area. Not sure if there is a link there or not.
I keep hoping someone will uncover something that will bust this brickwall open. Would love to know about this Adams line.