Do you know if Wilhelm's mother is Maria Agnes Butterwege? I am researchig my husband's Strauch/Bowinkelmann line and while I haven't found a direct link there might be a possible link. Jacob Strauch mentions as a reference his brother-in-law Wilhelm Bowinkelmann. Jacob's wife, Theresa Bowinkelmann, was the dau/o Johann Heinrich Bowinkelmann & Theresa Voss. Johann Heinrich - born ~ 1832 - was the son/o Peter Bowinkelmann and Agnes Butterwege, who were married in 1818. Wasn't one of William's daughters named Agnes?
There just might be a link somewhere.