Hi
Andrew Porter (1875) was my great grandfather - His daughter Eileen (1910) was my grandmother and her sister Kathleen was born 08-08-1920.
Checked online free 1911 irish census and unable to find anything on my grandmother, Eileen, or great grand-parents, Andrew and Catherine, however did find my great, great grandfather Andrew (1842) and his daughter, Aletha (1873).
Andrew Porter(1875) is buried, with Catherine and daughter Kathleen, as you thought correctly in Glendermot Cemetery.
What is your connection with this family?