The siblings belonged to a County Antrim family which had many representatives in the U.S. bearing the names of Mulholland, Mullholland, Milholland, and Millholland.

Members of the most prominent branch of the family were for a century leading cotton spinners of Belfast, the eldest line of which was elevated to the British peerage as Barons of Dunleath.

[4][8] Her first story for young children, was published by Messrs. Marcus, Ward & Co., of Belfast, and by John Murphy, of Baltimore.

Another translation included The Power of St. Joseph - A Book of Meditations and Devotions in honour of the Foster-Father of Our Lord, by the Rev.

[9][10] Bound Together - Six Short Plays for Home and School (Baltimore : John Murphy & Co., 1897) was co-authored by Clara and Rosa.