Is the old Bible record you are talking about Rachel Hedges' Bible and the person who furnished that info Joanne Eustice?If so, I contacted her several years ago and was able to obtain a copy of the work she updated and indexed for the HedgesFamily Association.She addresses some of those questions.
There is also some research on Ephraim Vause done by a researcher at Explore Park near Roanoke. He is planning to publlish his work so I would let you contact him directly or just give you his conclusions and sources regarding relationships. He has been in charge of a reconstructed fort built on the research on Ft. Vause that is at the Library of Va.You can check "1750s Frontier Fort" on www.explorepark.org for a photo.The page with additional info on Vause is no longer there or I couldn't find it, but I printed a copy some time ago.
I would be happy to send copies of these to you if you want to supply an address.There are numerous pages with documented sources.