In the Illinois Statewide Marriage Index, I found:
Patrick James Cosgrove married Myrtle Miles on April 28, 1891 in Winnebago County, Illinois.
In the 1910 US Census, living at 2878 S. Throop Street, 4th Ward of Chicago, Cook County, Illinois, page 161A, I found:
Cosgrove, Patrick J., M, 47, Ireland, m. 20 years, gas maker, gas house, immigrated 1881.
Cosgrove, Myrtle M., F, 42, Illinois, NY, PA, m. 20 years, 11 children/8 alive
Cosgrove, John J., M, 19, IL, Teamster, Press
Cosgrove, James P., M, 18, IL, Printer, Newspaper
Cosgrove, William, M, 17, IL, Errand Boy, Office
Cosgrove, Myles, M, 12, IL
Cosgrove, Francis, M, 11, IL
Cosgrove, Kathleen, F, 8, IL
Cosgrove, Bartholomew, M, 7, IL
Cosgrove, Margareth, F, 3, IL
In the 1920 US Census, living at 3063 Lock Street, Chicago, Cook County, Illinois, Page 241b, I found:
Cosgrove, Patrick, M, 56, Ireland, gas maker, gas company, immigrated 1885.
Cosgrove, Myrtle M., F, 52, Illinois
Cosgrove, James, M, 27, IL, Printer, Print Shop
Cosgrove, Francis, M, 21, IL, Packer, Meat
Cosgrove, Kathleen, F, 19, IL, Biller, Retail Store
Cosgrove, Barclay or Barday, M, 18, IL, Chauffeur, grocery store
Cosgrove, Margareth, F, 12, IL