At his father's church, Lily Yeats, sister of W. B. Yeats, was a parishioner.[https://archive.is/20070526235936/http://irishartsreview.com/html/features/yeats/feature_yeats.htm]. There was also a family relationship: Gibbon and the Yeats family were cousins. There was no love lost between the poets Gibbon and Yeats, however; and the biography Gibbon wrote was rather hostile. Yeats in return said of Gibbon: "Monk Gibbon is one of the three people in Dublin whom I dislike... Because he is argumentative!" In 1963, Gibbon collaborated in the editing and publication of Michael Farrell's posthumous novel "Thy Tears Might Cease".