I have found several spellings for his first name Achinson and Atchinson.
Atchinson was from a prominent family from Northern Ireland and was studing to be a lawyer. He fell in love with a Catolic severant, who he married. His father, an orangeman from the north hated Catolic’s like poison, disowned Atchinson and made him leave the family. Atchinson and his wife sailed to American. His wife died in America giving birth to a 17 pound baby, Robert. Here in America Atchinson worked as a motorman and ran a trolley car in Connecticutt. After his first wife died he remarried Julia Bloss Geer, and their union provide Augusta Bessie and Julia Mae. Achison died of a heart attack shortly after accidently running over someone, and killing them, with his trolley.
From the 1900 US Federal census;
Atchinson O’Brien – head of household, age 48, born Aug 1851 in Ireland, father and mother and were also born in Ireland – immigrated to America in 1881. Occupation motorman.
Julia – wife, age 37, born July 1863 in Germany, father and mother were also born in Germany – immigrated to America in 1872
Trena Gier – step daughter, age 8, born in CT, father born in CT mother born in Germany
Robert O’Brien – son, age 17, born in Illinois father and mother born in Ireland – occupation druggist
Bessie O;Brien – daughter, age 6