I happened across these CASSIDYs in the 1910 Brooklyn NY census.
James CASSIDY, 55, marr 26 yrs, b. NY, parents b. Ire, Engineer @office bldg
Mary Ann, 52, wife, 6 children, 6 living, parents b. Ire
Anna, 24, dau, b. NY
Loretta, 21, dau, b. NY
Grace, 18, dau, b. NY
Viola, 15, dau, b. NY
Emma, 13, dau, b. NY
Alfred E. TAGGARA, 34, widower, b. NY, par b. NY, bookkeeper@life ins co
Alfred E. TAGGARA, Jr, 10, son, b. NY
ED 312, sheet 1, 156 Ainslee St.
William CASSIDY, 36, marr 5 yrs, b. NY, father b. NY, mother b. Ire,
lithographer
Millie, 33, wife, 1 child, 1 child living, b.NY, father b. NY, mother b. Ger
Chester, 4, son, b. NY
ED 313, sheet 10, street not readable
Mike CASSIDY, 27, marr 9 yrs, b. NY, parents b. Ire, letter carrier
Anna, 28, wife, 3 children, 2 living, b. NY, parents b. NY
Arthur, 8, son. b. NY
Irene, 6, dau, b. NY
ED 313, sheet 14, 105R Elm
Nancy
Wallingford CT