Yes, I was just reading about "Fred" or Friedrich Prechel and checking his census records (I find him in the 1870 and 1880 censuses with wife Jessie from Holstein but by 1900 she is a widow-- they had 8 children, all living in 1900). He would seem to be a brother or cousin too.
William, I believe, is a son of John Proechel. "Friedrich Wilhelm" was born 29 April 1851 in Radsitz, Wirsitz County, Posen.
There are lots of connections here.
Thanks for the interest.