Looking for Mary Jane Kennedy Nee Maguire of Brooklyn

Mary Jane b. 1848 CO. Cavan married James Kennedy in Manhattan May 1869 from this marriage there were four children Frances b 1873, Sarah, Thomas H. b 1880, & Ellen b. 1886 they were all born in Brooklyn. Sarah married John T. Campbell 1893 from this marriage there were 6 children. Looking for information on John E. b. 1899 and died Dec. 1993, most of these two familys were all buried at Green-Wood Cemetery.
Regards
Michael
Australia