I don't think I can be of much help, but I will pass on what little information I have.
I have Michael Kavanagh no dates of where born with 2 sons.
1 Samuel born c 1851 Wicklow died 1901. He married Ellen Reynolds born Arklow and married c 1872 in Arklow. They had children Thomas bc 1875, Samuel c 1880.
Mary c 1882, Charles c 1884, Annie c 1891, Michael c 1897, Bernard c 1899.
2 James bc 1856 in Wicklow died 1903 married Catherine Wall of Wicklow 6th July 1879. James was responsible for the building of the Fastnet Lighthouse.