I will be traveling to Germany next week to do genealogical research on the Helwig line.I have a 3rd ggf Joseph Helwig from Irmtraut, Germany (in the Westerwald area south of Essen) whose genealogy I am just beginning to research. I will watch for a connection to your Hellwig/Helwig line from southeastern Northrhine-Westphalia. My Joseph was born March 22, 1825. His wife was Marie Charlotte Witt. He immigrated to the USA in 1868 prior to which he was living in Gutzkow, Germany (north of Berlin).
He lived in Missouri where he was postmaster and a stone mason.
If you have other extensive Hellwig/Helwig family info, I'd appreciate hearing from you.