I am searching for any decendants of Margaret O'MALLEY Sullivan who was listed as a sister to my g-grandfather John J O'MALLEY in his 1904 obituary in Johnstown, Rock Co, WI. and living in Syracuse NY USA at the time. The 1880 NY census of Syracuse NY USA has a Margaret married to a Cornelius Sullivan and a family of 6 children. I could not find this family on the 1900 census. John was born in Co May IRL about 1839. Any help with this research would be greatly appreciated. Mary Kay