I have a lot of information on the DeHaven line, at least 100 years behind Linda Hannah. She was Isaac Dehaven's daughter, her mother is Elizibeth Ann "Nancy" Ellis. She's mentioned as "Nancy" in her father's will - Robert Ellis Sr.
Isaac Dehaven is the son of Abraham Dehaven. Isaac's mother was Rebecca Pawling. I recognize the Polling name, but I'll have to look through what I have to find where it connects.
I have that Abraham died about 1770 in Loudoun County, VA & his wife Rebecca died about 1776 in Loudoun County, VA. Abraham DID have a son named Abraham married to an Ann Lucken, but I assume the one you're referencing in the suit to be the elder Abraham.
Feel free to send me a private message, or e-mail & I'll type up what I have. My email is rmschoonATyahooDOTcom