Dear Ann
It is good to hear from you. I believe we may well be talking about the same family. From my research of 'Ireland Births and Baptisms, 1620-1881' records I found the birth records of my grandfather William Geehan showing his date of birth as 19 May 1874 and his father's name as Jeremiah Geehan and his mother's name as Julia Bowler.
I also found records of some of their other children John, Mary, Michael (born 29 April 1879), Catherine, Jeremiah, Timothy, and Julia Geehan.
The 1901 Census records for Dooaghs Commons record:
House 5 - Jeremiah (57) and Julia (47) Geehan living with 4 of their children, William (27), Kate (18), Abby (16), Julia (9). Jeremiah must have been born around 1844.
House 4 - Michael (60) and Margaret (40) Geehan are living with 2 children, Ellen (11) and Jeremiah (9).
The ages and the location of their homes suggest that Jeremiah and Michael could indeed have been brothers.
The 1911 Census for Dooaghs Commons records:
House 7 - Margaret Guihan is now 52 and the head of the house. She is living with her son Jeremiagh aged 19.
House 6 - Jeremiagh Guihan now 71 and Julia 61 are living with Catherine aged 28 and Julia aged 20.
House 8 - is the home of my grandparents William and Mary Guihan, aged 36 and 31 and their first 2 children, Jeremiagh aged 2 and Mary 1. This Mary is my aunt and I knew her as Aunty May, a very sweet and lovely woman who came to Australia with her husband John Barry and 2 sons not long after my parents emigrated in 1955.
I would be very interested in any information you have found about the Guihans.
Best wishes
Sylvia Petrony
NB We are hoping to visit Ireland again in September or October 2017.