Parents are Alphonso & Anna Sproul.

George is listed on the 1900 census as - Worral Sprowl (born March 1898) and living in Collingdale, PA with parents and siblings.

On the 1910 census as - C Worrell Sproul and living in Lansdowne, PA with parents and siblings.

On the 1920 census as - George Sproul living Lansdowne, PA with parents and siblings at same address as WWI Draft Record.

Hope this helps getting you on the right track.

Looks like Aphonso Sproul's parents were Jacob & Josephine Sproul from Delaware.

Alphonso is listed on the 1870 census as - Laphonza Sprowl and on the 1880 census as - Lafoura Sproul.

I also just found obits for Aphonso & Annie Sproul. If you contact me with your email address I'll send you scans of the newspapers.