Dear Mr. Kelly,
Thank you for posting your request on History Hub!
Using the names and information from the previous poster, we suggest that you search recent city directories available at The New York Public Library and inquire for a listing of other searchable resources. You also may wish to search Ancestry, FamilySearch, and local newspaper archives for mention of the children and grandchildren of Delia Hynes Fahey. There may be a fee for using these services. Instead, you may contact your local library. Many library systems subscribe to these sites, making them free for patrons.
We hope this is helpful. Best of luck with your family research!