Patrick had a sister, Derarca, known as St. Derarca and the "mother of saints" because of her children's careers. Our first indication of her comes from the Vita tripartita Sancti Patricii (Tripartite Life of Saint Patrick), which is believed to have been written within a century of Patrick's death. It mentions that Patrick had two sisters, and when he came to County Derry for an ordination he found three deacons there who were his nephews. (To be honest, Patrick's own very brief account of his life mentions no sisters.)
Legend says that Derarca married twice. Her first husband was purported to be Conan Meriadoc; she bore him Gradlon Mawr, later King of Brittany. (Another legend says that her first husband was Restitutus the Lombard.) Her second husband was Conis the Briton. If you add up all the children attributed to her, you have 17 sons—all of whom became bishops and/or saints—and at least two daughters. (The illustration shows where her house is said to have stood, on Valentia Island in Kerry, of which she is the patron.)
Her daughters were Saint Eiche of Kilglass and Saint Lalloc of Senlis. Her other children included Saint Sechnall of Dunshaughlin; Saint Nectan of Killunche; Saint Auxilius of Killossey; Saint Diarmaid of Druim-corcortri; Dabonna, Mogornon, Drioc, Luguat, and Coemed Maccu Baird.
The three deacons Patrick encountered in Derry, however, were Saint Reat, Saint Nenn, and Saint Aedh. They are commemorated on 3 March, 25 April, and 31 August. Some records say Patrick had several sisters, and I am not certain of the mother of these three.
There was one child in particular, son of Derarca and Conis, of whom we do hear more, and that is the Mél of Ardagh mentioned above. I'll tell you about him tomorrow.
