James FLANAGAN married Edith MAY in March qtr 1896, St. Columb district (vol 5c page 155). A birth was registered in the same district December qtr 1896 for a Joseph Patrick FLANAGAN.
Using FREEBMD you can then tell that several children were registered in Plymouth district with the surname FLANAGAN between 1902 and 1910:
Margaret Mary; Edith; James; Ernest Terence; William Joseph and May Winifred. However, the latter 2 are probably the children of William & Louisa FLANAGAN.