Harrison was married to Bertha Marie White (1857–1933). In 1903, their houseman robbed Bertha of $17,000 worth of jewels from their Glenside home while the family was eating Thanksgiving dinner. He was later arrested and the jewels were returned. Together, they were the parents of: • Geraldine Dorothy Harrison (1880–1903), who married John Childe Anderson (1867–1941), a son of
Adna Anderson, in 1902. • William Welsh Harrison Jr. (1881–1965), a financial supporter of
Abington Hospital. In his will, he dictated that his bachelor son must wed to keep a $1,000,000 bequest within the family. His widow died at her home in
Oak Lane, Philadelphia in August 1933.
Grey Towers In 1881, 31-year-old Harrison purchased Rosedale Hall
Glenside, Pennsylvania, from J. Thomas Audenreid and expanded the estate to 138 acres by 1891. He hired architect
Horace Trumbauer to build new stables and a gate house, completed in 1892. In 1893, Rosedale Hall burned to the ground and Harrison again hired Trumbauer, in what is considered his first major commission, to build a new home on the site. Trumbauer designed an imposing 40-room mansion, inspired by
Alnwick Castle, the medieval seat of the
Dukes of Northumberland. The house cost an estimated $250,000 and was completed five years in 1898. After his death in 1927, his widow sold Grey Towers in 1929 to Beaver College (now
Arcadia University), for $712,500 equal to $ today. ==References==