Did his mother Sarah marry after 1911? There is a Banbridge marriage for a Sarah Noddings in 1912. The other names on the page are David Fry, Samuel McCarrison, Thomas Doak.Groom is David Fry- father called John. Sarah's father is Christopher.
I know that Edmund was born in 1890 in Seapatrick nr Banbridge and was living with his grandmother Sarah Noddings and two aunts in the 1901 census. An online tree gives birthdate as 22 Sept.1890 with his mother as Sarah Noddings. Note: the 1901 census does not say that Sarah and Lizzie are his aunts.
The same tree says Sarah married 1902 to James Gray but gives her parents as Albert Noddings & Elizabeth Truesdale

Checking GRONI's index, Edmund Noddings born 22 Sept.1890 Banbridge district but no mother's maiden name shown so he likely was illegitimate.