You may want to check the census data for New York. Here is what I found.
1900 census Brooklyn New York, George W. Nagle age 41, wife Louise age 32, son Lawrence age 14, Charles age 12, Walter age 11, and Harriet age 9, all were born in New York.
1910 cenus Brooklyn New York, George W. Nagle age 51, wife L. M age 42, and Walter J, age 21.
1920 Census Brooklyn New York, Walter J. Nagle age 31, wife Mildred age 27, mother-in-law Florence Ashmore age 47, Stanley Nagle age 18 months, sister-in-law Dorothy Ashmore age 20, and great Aunt Mary Ripley age 68.
1930 census Queens New York, Walter J Nagle age 41, wife Mildred age 37, Stanley age 12, and Evelyn Nagle age 9.
George was probaly son of John and Charlotte Nagle who appear in both the 1880 and 1870 census for Manhattan.
You could also check with the New York City archives for birth, death and marriage records.