They were Irish immigrants and arrived in New York in 1870 .
Contrary to many accounts , Atz was not Jewish ; his maternal Grandparents were John ( b 1820 ) and Mary ( b. 1820 ) Flaherty .
Grandparents were Irish Grandparents and arrived in New York in 1870 .
Contrary to many accounts , Atz was not Jewish ; his maternal Grandparents were John ( b 1820 ) and Mary ( b. 1820 ) Flaherty .