It looks like Nellie LS b. Ontario, is the dau. of John Stewart Jerden and Annie Martin. Roberts dob is December 21, 1877. He might be the son of Henry Bird and possibly Margaret. Do you know the names of any of his siblings - shown in census data below.
Citing this Record: "Pennsylvania, Philadelphia Marriage Indexes, 1885-1951," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/JJL9-B5R
Philadelphia Marriage Indexes
Name: Bird
Spouse's Name: Nellie L S Jerdan
Event Year: 1900
License Number: 128471
Image Number: 00069
Digital Folder Number: 4140444
Citing this Record: "Pennsylvania, Philadelphia Marriage Indexes, 1885-1951," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/JJ6X-BTT
Name: Robert Bird
Spouse's Name: Jerdan
Event Year: 1900
License Number: 128471
Image Number: 00201
Digital Folder Number: 4140386
Pennsylvania, Philadelphia City Death Certificates, 1803-1915
Citing this Record: "Pennsylvania, Philadelphia City Death Certificates, 1803-1915," index and images, FamilySearch (https://familysearch.org/pal
Name: Nellie Bird
Death 10 May 1910 Philadelphia, Philadelphia, PA
Birth March 20, 1906 Philadelphia
Father Robert Bird Birthplace Philadelphia
Mother Nellie L. S. Jerdan Birthplace Canada
Burial Place: Green….. ilegible
Image Number: 00137
Ontario Births, 1869-1912
Citing this Record: "Ontario Births, 1869-1912," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/FMQT-645
Name: Nellie Loui Stewart Jerdin
Birth 19 April 1883 York, York, Ontario, Canada
Father's Name: John Stewart Jerdin
Mother's Name: Annie Martin
Registration Number: 41300
Image Number: 00612
World War I Draft Registration Card
Citing this Record: "United States World War I Draft Registration Cards, 1917-1918," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/K6KH-BVV
Name: Robert Bird
Address 3156 Reach, Phila, PA
Employment Conductor, Phila Rapid Transit
Draft Registration 9/12/18 Philadelphia City no 31, PA
Status Male White married
Birth Date: 21 Dec 1877 US
Nearest relative Nellie LS Bird, Wife, 3156 Reach
Robert may or may not be the man in the census data below, although parent Henry was b. in England.
US Census, 1900 D 796 Philadelphia city Ward 31, Philadelphia
Name: Robert Bird
Birth Date: Dec 1877
Birthplace: Pennsylvania
Status Boarder White Male Single
Father's Birthplace: England
Mother's Birthplace: Pennsylvania
US Census, 1880 Philadelphia, Pennsylvania
Citing this Record: "United States Census, 1880," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MWV7-8VS
Self Isaac Bird M 59 England
Wife Elizabeth Bird F 56 England
Son Henry Bird M 33 England
Grandson Isaac Bird M 10 PA
Grandson Charles Bird M 4 PA
Grandson Robert Bird M 2 PA
Daughter Maggie Bird F 26 ---
U S Census, 1870 Philadelphia, Ward 21, PA
Henry Bird M 24y Eng
Margaret Bird F 20y PA
Isaac Bird M 3m PA birth month Mar