Looking for any info on the following Mannixes:
great grandfather Martin Gabriel Mannix:
Born in Ireland 1839 or 1846 emigrated to NYC.
Son of a William Mannix born approx 1820 and Ann Ryan in Ireland. Unsure about Ryan being her last name
Martin Gabriel married Catherine (Kate) Nevins in NYC in 1872 and was a grocer.
1880 Census has Martin and Kate Mannix, both from Ireland, age 34 and 30
1900 Census both Martin and Kate listed year of immigration 1863 from Ireland
My late Aunt Lorraine Mannix left some info that Kate's father was Michael Nevins, mother possibly a Mary Derner, Kate may have had a sister Julia who also emigrated to the U.S., possibly the parents too.