Have recieved a large amount of information from Frank Speckmann regarding this line.
I am hoping he or someone else can confirm that Diedrich's father is Johann Hinrich Wempe born circa 1750 in Oberlethe, and his mother is Anna Margrete Bolling, Westerburg. I also have discovered a possibility that Johann Hinrich's (ca 1750) father is a Johann Hinrich Wempen, b circa 1715, who was married to a Liesbet K�hn in Wardenburg.
Many thanks to all
Tania Taylor