We are a little confused. In your latest email you refer to Lucy's father being an Ewert not a Fisch. I presume you meant Fisch.
About 10 years ago I communicated with a fellow by the name of Art Fisch who lived in Riverside, California. He was a direct descendant of Peter Fisch. He told me that Peter or Pierre Fisch, the altar maker, came to America in 1872 from the Riemisch region of Luxembourg. He came in 1872 from Liverpool to Boston.
I believe he was married to Katharina Theisman. If you are interested in contact information for Art send me an email.