John's WWII draft card shows he was born Feb 6, 1880 in Schuylkill Haven. John and Esther (Hester and Ester) appear in the 1930, 1920 and 1910 censuses living in Montgomery County. I could not find John in the 1900 census. In the 1880 census no one with the Strouse name (or anything similar) was living in Schuylkill Haven area in June 1880 that had a son William or John born around that time.
If you know when and where he died I suggest getting his death certificate and obituary.
Try the Historical Society of Montgomery County and the Historical Society of Schuylkill County to see if they can help you.