As a base from which to work is this the family who's children you are hoping to follow through for marriages, deaths and offspring?
Quincy Ward 6, Norfolk, Massachusetts
Cornelius Francis Duggan 39 Ireland
Mary Duggan 37 Ireland
Patrick Duggan 77 father widowed Ireland
Patrick John Duggan 11 Nov 1888 Massachusetts
Mary Ellen Duggan 9 Jan 1891 Massachusetts
Kate Duggan 5 Jan 1895 mass
Cornelius Francis Duggan 6 born July 1893 Mass
Nellie L (Ellen louise) Duggan 2 March 1898 mass
Nora Gertrude Duggan 0 May 1900
In 1920 another child Charles P Duggan born c1905. Also Nellie is now Ellen L,
Charles Duggan
SSN 031-22-7307
Last Residence 02171 Quincy, Norfolk, Massachusetts
Born 4 Dec 1904 Died Sep 1972
Veterans affairs
Charles Duggan
Birth 4 Dec 1904
Death - 4 Sep 1972
SSN - 031227307
Branch 1 - Navy
Enlistment Date 1 - 12 Aug 1942
Release Date 1, - 24 Jul 1946
Charles was till single in 1940
There is a public tree on ancestry which could be very helpful in your search. It appears to be well sourced