I have a major Dietz line in my family. The furthest ancester I've been able to trace back to is a Charles Dietz. I believe he was born in Germany. Later generations are prominent in Michigan. Do you have any additional information on your Charles, such as birthdate, birthplace, names/locations of children? I've been out of town for an extended period so will have to do some digging in my records, but the name Rosina seems very familiar to me.