I am looking for connections to the following family.

Dennis McMahon born Ireland, died between 1847 - 1850 in Michigan. Dennis married Anna O'Brien who was born about 1820 in Ireland and died in Michigan. Children of Dennis and Anna McMahon were:

James McMahon born abt 1841 in Michigan
Elizabeth Francis McMahon born July 1845 in Kent Co, Michigan
Catherine McMahon born abt 1846 Michigan
Mary McMahon born abt 1848 in Michigan

After Dennis McMahon passed away Anna O'Brien McMahon married Thomas Kinney who was born about 1824 in Ireland. Thomas and Anna O'Brien lived on a farm with Anna's father Patrick O'Brien who was born abt 1876 in Ireland. They lived in Walker, Kent County, Michigan.

Who were the parents and siblings of Dennis McMahon