Hi,
I found 2 records for you. The first one is the 1881 census with William and his father and all his siblings.
Francis Sheltery 58
Mary Sheltery 53
William Sheltery 28
Alfred Sheltery 20
Maxim Sheltery 13
Derich Sheltery 26
Levoy Sheltery 25
Clarry Sheltery 15
The second is his New England Naturalization record. You can call up NARA in Waltham MA and they will send you the naturalization record. This record also gives his father's name as his witness. The NARA link is below.
http://www.archives.gov/northeast/boston/Good luck!
Liz