Trying to help you track down the Sullivan's. I did find Christian listed in both the 1850 Census and the 1880 Census. It states in both places that Christian was born in Ohio. If your Jeremiah was born in Lowell, Ma., it might not fit the "brother profile". Christian's kids are listed in 1850: Sarah, John, Francis M.,Angeline and Josephine. By 1880, all those kids are gone and the census shows only 2 daughters, both grown, Lizzie married to Newton Davidson and Louisa married to a Mister Norris. Christian's parents are listed as born in Ireland. Hope this adds some insight. I'll continue to look for you if something comes up. Gale