Try familysearch.org for ancesters etc. His mother (Margaret M. (Maggie) Burkett/Borket is listed as widowed in 1910 - so his father, Joseph G Burkholder must have died when he was young.
United States Census, 1910 Reading Ward 16, Berks, PA
self Margaret M Burkholder F 37y PA Widowed
dau Alma M Burkholder F 13y PA
son R Edward Burkholder M 8y PA
dau S Herminah Burkholder F 5y PA
United States Census, 1900
https://familysearch.org/pal:/MM9.3.1/TH-266-12329-41028-67?cc=1325221&wc=MMPJ-DHH:2118607822
head Samuel R Burkholder M 51 Jan 1849 PA married 31 years
wife Sallie A Burkholder F 47 Nov 1853 PA 7 children 5 living
dau Hermima Burkholder F 23 PA
son Edward S Burkholder M 22 PA
dau Alice Burkholder F 15 PA
son Joseph G Burkholder M 29 Feb 1871 PA married 5 yrs
daughter-in-law Margaret Burkholder F 28 May 1872 PA 1 child 1 living
granddau Alma Burkholder F 4 Nov 1896
Pennsylvania, Births and Christenings
https://familysearch.org/pal:/MM9.1.1/V2NR-BYL
name: Joseph Ganser Burkholder Male
CHRISTENING 02 Jun 1872
TRINITY LUTHERAN CHURCH, READING, BERKS, PA
father Samuel R. Burkholder mother Sallie
Pennsylvania, County Marriages
https://familysearch.org/pal:/MM9.3.1/TH-1942-21130-47876-20?cc=1589502&wc=MMY5-SLQ:n1769951707
name: Joseph G. Burkholder
Residence Union House, Reading PA
(Prev Divorce June 14, 1895)
Marriage 06 Jun 1896 Reading, PA
Official: FK Huntzinger, Minister of the Gospel
age: 24 est birth 1872 Reading, PA
father: Samuel R. mother: Sallie A.
spouse: Maggie M. Borkert
Residence 936 Penn St, Reading, PA
age: 24 est birth 1872 Reading, PA
father: Albert mother: Amanda
reference number: Vol 17 Page 297
