Anton [Antanas in Lithuanian] Anthony DAVIDAITIS married in "old country" or US? If in US than the church they were married in should have a copy of their marriage record which should have a place of birth.
From what document did you get that Benedikta's maiden name was MORRIS?
You have the wife's and 2 children's naturalization intent and petition?
Have you contacted the church that Constantin and Anton were baptized in? Want to say the church baptismal record should have parents place of birth.
3 DAVIDITISs and 9 DAVIDAITISs in SSDI and all 3 in Massachusets.