This death record appears in FamilySearch, and if it is the correct Phillip, suggests his father's name was Samuel.
name: Philip Fox
death date: 10 May 1912
death place: Chicago, Illinois
race (original): W
race (standardized): White
death age: 55y
estimated birth year: 1857
father: Saml Fox
father's birthplace: Russia
mother's birthplace: Russia
street address: 1836 Hastings St
cemetery: Forest Park
burial date: 12 May 1912, 11 am
informant: Rebecca Fox, 1013 Marshfield Avenue.
Citing this Record
"Illinois, Cook County Deaths, 1878-1922," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/N7JX-3BF
: accessed 20 Nov 2012), Philip Fox, 10 May 1912.