Michael Kelly Jr., b. 1821

I am tracing the genealogy of my wife's family.  Her maiden name is Eileen Mary Kelly.  Her father was Charles C. Kelly, b. Yonkers, NY, 1922, d. 1968, Center Moriches, NY.  Her mother was Joan W. Brophy, b. 1923, Yonkers, NY, d. 2005, Stony Brook, NY.  Her grandfather was Charles A. Kelly, b. 1867, Yonkers, NY, d. 1965, Yonkers, NY.  Her great grandfather was Thomas H. Kelly, b. 1846, Poughkeepsie, NY, d. 1896, Yonkers, NY.  Her great great grandfather was Michael Kelly Jr., b. ca 1821, Clontuskert, Ireland.  We believe he was in NY before 1840.  He appears in the 1850 census in Poughkeepsie, NY.  He was listed as a merchant, living on Mansion St..  Living with his family in 1850 was a Patrick Kelly, who was 67 years old that year, also born in Ireland.  We believe this was Michael's uncle.  Michael's wifes name was Elizabeth, born in Clontuskert.  Can you offer any assistance with this information?