...Today I received the birth certificate of my Father's elder sister Annie Elizabeth Violet Clark born 18th May 1915. This cert has some interesting details. According to this, the residence is shown as 3 O'Brien's Place and the birth registered district is shown as Donnybrook No. 1. My Grandfather James Henry Clark is also shown as expected at Marlborough Barracks and recorded as a private in 5th RI Lancers.As my Grandmother Mary is shown as formally Killeen I presume they were married before 18th May 1915....