Of 118 Wrentham Street, Dorchester and working as a waitress at the time of her marriage.

1910 Census says she came to the US in 1905.

1930 census Wakefield, Middlesex, Massachusetts:
They own a home at 2 Main Street.
Thomas E Cassidy 46, a house painter
Margaret L Cassidy 41
Thomas E Cassidy 15
Margaret O Cassidy 12
John W Cassidy 10
Rose M Cassidy 6
Ronald L Cassidy 4 [4 6/12] 
Katherine J Cassidy 1 [1 9/12]