[Ger-Poland-Volhynia] Trying to locate-Metzlaff

[margaret]

I have a question.  How many of the people who came to US with
families returned to Pommern?
I am trying to locate the family
of Rheinhardt Metzlaff, his wife
Wilhelmine was my husbands
great aunt.  I found them in the
1880 census in Ironton Ohio and
from they dropped out of sight.
No other census, no passenger ship records, no naturalization papers, no death records. They had one daughter who sent a postcard to a cousin
in 1912 from Lindenhurst LI NY
to say she had had a baby.  No mention of date of birth, sex of child, nothing. Wonder how she got to Lindenhurst?  I have found others with that name, but no information to connect them.  Can anyone tell me where to turn or where to look.  I am really curious if many of them returned
for some reason?
Thank you.
Margaret