Jessica, It is wonderful to hear from you! My grandmother was Mary Ann (Molly) Kenny who was just a little older than your great grandfather, John Kenny. I have a picture of the two of them together but it is too many megabytes to attach to this post. I would be glad to share it with you through email. My grandmother married Cornelius O'Neill and my father, Edward Thomas O'Neill was their oldest son. My father was born and died in Coalinga, California. He had a brother, Cornelius Kenny O'Neill and a sister, Mary Ann O'Neill who are also deceased.
Using the list of brothers and sisters that my grandmother, Molly, remembered, I searched parish and civil records and only came up with 14. They are Mary Kate, born 6 Dec 1872, Mary Jane born 21 March 1874, died April 1883, Thomas, born 13 sept 1875, Catherine, born 20 Oct 1876, Patrick Joseph born 27 Dec 1877, Bedelia (Delia) born 28 Jan 1879, died 13 May 1950, Teresa Mary (Tessie) born 2 May 1880 and married Edward Nulty and died 6 Sept 1949: Tillie born abt 1884, Michael born abt 1885, Daniel born abt 1887, Mary Ann (Molly) born 11 Nov 1887 and died 17 Nov 1961, Bernard born abt 1889, John Asicus and James born abt 1893. Does your list of 15 include a name my list doesn't? I also have a copy of a picture taken in about 1910 that includes my grandmother, Molly, Delia, Tessie and two of their brothers but I not sure which two. I would be happy to share that picture too. Maybe you can help with which two brothers are in the photo.
My research of the records of Boyle parish in County Roscommon shows that Michael Kenny son of Thomas and Catherine, had two sisters, Maria and Johanna.
I live near Chicago. Where do you live, if you mind me asking?