I'm not related.
Their 1902 immigration record indicates they were from Forbach. Written about Forbach is Wurtemberg. There are two Forbach's. One is city in Lorraine adjacent to the German border. The other is a village in Baden-Wurttemberg.
I found it on Ancestry. To view this record for free check with your local libraries to see if they have Ancestry.
You could also try to get the death certificates and obituaries for anyone born in Europe. In addition to having the parents' names sometimes the exact place of birth is indicated.