Hi Sue,
I have been doing a bit of research on your family, and Im just wondering both sides of your family, Lehanes and Shehans came from Kilroe? There are no records of Lehanes in the Tithe Applotment Books for that area. You mentioned that Timothy Lehane was a farmer, so I was hoping to find a lead there. However there are records of Michael Shehan Grenane Kilroe ,Dennis Shehan, Grenane, Kilroe, and Patt Sheehan, Grenane KIlroe on the Tithe Applotment Books of 1833.
http://titheapplotmentbooks.nationalarchives.ie/search/tab/results.jsp?surname=&firstname=&county=Cork&townland=Grenane&parish=Kilroe&search=Search&sort=&pageSize=&pager.offset=10
Also in Griffiths - Valuation 1847-1864 there are records of Sheehans.
Mary Sheehan, Grenane St. Lower, Kilroe
Denis Sheehan, Grenane St. Upper, Kilroe
Jeremiah Sheehan, Knocknacolan, Kilroe
http://www.askaboutireland.ie/griffith-valuation/index.xml?action=doPlaceSearch&Submit.x=38&Submit.y=10&Submit=Submit&freetext=Kilroe&countyname=CORK&baronyname=&unionname=KANTURK&parishname=KILROE
Also the 1901 Census there is a record of a Margaret Lehane. This is the only record of Lehanes that I have come across. There is no townland of Kilroe listed in the Kanturk area in the 1901 Census which I am a bit puzzled about, and must look into.
http://www.census.nationalarchives.ie/pages/1901/Cork/Kanturk/Coolacoosane/1148316/
I hope this information will be of help. Let me know if the Lehanes originated elsewhere, and I will have another look.
Regards Doreen