Kilmartin, Dennis Family

I am trying to find any records of Dennis Kilmartin who was born in Ireland about 1807-1815 and died, as far as I can tell, around 1870.  An 1850 Census lists his age as 35 putting his birth in 1815, the 1870 Census shows his age as 63 putting his birth in 1807 and the 1860 census lists him as 50 putting his birth in 1810.   He married  Johanna Condon and had five children: Bernard Kilmartin 1836-1914, Edmund or Edward Kilmartin 1840-1909, Jeremiah Kilmartin 1842-1910, Patrick H. Kilmartin 1842-1903 and Margaret Kilmartin 1846-1918.  I am descended from Patrick. The 1860 census from Orange, Ionia county, Michigan also shows Dennis and Johanna and their children Patrick and Margaret all having the last name Gilmartin. 

I have an obituary from 1914 stating Bernard, son of Dennis was born in county Limerick but came to America when he was 8 years old (around1844).  He married Ellen Humphrey of Ionia, Michigan.  

I am also trying to find any infomation on a different Jeremiah Kilmartin, 1814-1907 and his parents Bernard Kilmartin and Margaret Reardon.  Jeremiah married Rosanna Coyl, daughter of Patrick Coyl and Rosanna McCabe. I feel fairly certain that this 2nd Jeremiah and 2nd Bernard are related to me but do not know how they fit on my family tree.

Any help would be greatly appreciated.