Apparently we have mutual cousins (but are not ourselves related). The info I have on the Rosings comes mostly from descendants of the Stoffels (two Rosing sisters married two Stoffel brothers) and from a descendants of John Rosing. I have no info on George Rosing and Clara Dorfler's children, and I would be interested in learning more.
In the meantime, here's a little family history. Gertrude Adams Rosing was the sister of my GGrandfather Bernard John Adams. They had a younger brother Johnwho married Anna Klein.There was also a younger brother Mathias b ~1857 d1859. Lore is that John and Anna had 12 children. The three Adams siblings had two older half-sisters named Odelia/(Tilla/Tillie in the St. Johns records) and Catharina Heyer .Odelia married Jacob Boncelett the same year that Gertrude married Frank Rosing (1863). Odelia and Jacob had three children, and I am in contact with one of their decendants. One of the Boncelett descendants married a Freund.
The parents were Nicholas and Gertrud Schmitt Adams who lived near Volo. They appear in U.S. census data for Goodale (now Grant) Township from 1850 through 1880. They and their children appear a number of times in the first volume of the St. John's records. It appears that they began attending church at St.Peter's in Volo when it was opened.
Nicholas and Gertrud were both born and grew up near the town of Cochem Germany. Apparently they knew each other in Germany. Gertrud's first husband was a man named Nicholas Heyer. The Heyers emigrated to the US and lived for a time in Ohio. Mr. Heyer apparently died shortly after Odelia was born in 1847. Family lore is that Gertrud "sent for" Nicholas Adams in Germany after her first husband died. Thankfully he was able, willing and available to relocate!
Nicholas was born in the village of Kennfus near Cochem in 1812. Since you mention the Scheids, his paternal grandmother was named Anna Scheid. The records I have indicate that she was born ~1730 in Cochem. I don't know any more about the Schied family than that. Do you happen to know where your Scheid family originated from in Germany?
BTW there was (and still is I believe) another "Adams" family in Johnsburg. They seem to have originated from the Eifel region as ours does and they attended the same church (St. John-the-Baptist). Its very easy to get the two families confused. So far I have not been able to establish any connection between the two, other than geographic.