The Genealogical Query feature is provided for you to request information - from other visitors to the website - on your O'Sullivan and Sullivan ancestors, and for you to provide assistance to others.
Michael
Did you have any luck tracing back your relatives, if so let me know please.
After looking back myself there is a bloodline in my family that i believe contains a Joseph, Michael, Patrick, Con and Kathleen. born circa 1880-1890 in county Cork, from this line Michael married Dorothy(Dolly).
As far as i know they had 2 sons Michael and Dennis born between 1905 and 1915.
Dennis being my grandfather had 3 sons with another woman, before he married my grandmother who had my father.
My father told me his 3 step brothers names were Michael, John and Terry and they were born between 1930 and 1940.
Being there was a trate for naming O'Sullivan's after first name (grandfather) and Second name (oldest uncle).
There could possibly be a connection to your Michael Joseph O'Sullivan, through the 1880-1890 bloodline or the 1905-1915 bloodline.
Many Regards
Nick O'Sullivan. 