I believe the family appears in the 1880 census of Ephrata:
Henry Long 24 Grace T. 21, parents born in Bavaria Lilly 1
I believe may be them because of their child Lillie and her parents born in Germany. But I could be wrong.
I suggest getting Henry' death certificate which the PA Dept of Health should have (assuming he died in PA). It should have his parents' names including his mother's maiden name. His obituary might have the data too plus list any surviving siblings.
I suggest checking with the Historical Society of Cocalico Valley in Ephrata to see if they can help you with the obit and other information.