My great-grandfather Isidore (Isadore) Dave (D'Ave)came to Green Bay, WI where he died in 1906. I cannot find records of his birth, immigration, marriage, etc. His death record indicated birth in Belgium. His wife's name was Francis or Francesca or Francoise Crum or Crumb or Crom. She MAY have been married before, so this may be her maiden or previous married name. Any help would be GREATLY appreciated.