Name: William Patrick Wills
Birth Date: 04 Jul 1876
Birthplace: Boston, Suffolk, Massachusetts
Father's Name: Michael
Mother's Name: Elizabeth A.
Indexing Project (Batch) Number: C00770-0
System Origin: Massachusetts-EASy
GS Film number: 1994569
Reference ID: v 8 p 134
Citing this Record "Massachusetts, Births and Christenings, 1639-1915," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/F46Q-X13 : accessed 30 Jul 2013), William Patrick Wills, 04 Jul 1876.
William was with the family in the 1910 census:
Name: William P Wills
Event Type: Census Event Year: 1910
Event Place: Boston Ward 25, Suffolk, Massachusetts, United States
Age: 33
Birthplace: Massachusetts
Affiliate Name: The U.S. National Archives and Records Administration (NARA)
Head William P Wills M 33 Massachusetts
Wife Euphenia Wills F 28 Canada
Daughter Kathryn E Wills F 4 Massachusetts
Citing this Record "United States Census, 1910," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M228-86S : accessed 30 Jul 2013), William P Wills, 1910.
In 1920, he was living with his widowed mother. I can find him in Massachusetts City Directories database until about 1927 in Boston, and I was unable to find in the 1930 US census.