I know this tells us nothing about any servants or employees, but the family of Brasier-Creagh is in Burke's Irish Family Records.
William Harrington Sherlock Langley-Brasier-Creagh, of Stream Hill;
b. 14 Apr. 1857; d. 15 July 1921. m. (1st) 14 Apr. 1887 Jane, only child of Henry Langley of Byblox, Doneraile [which is presumably when he added the name Langley]. She d. 4 May 1889 [it doesn't say so, but I imagine in childbed of a stillborn child or one that didn't survive]. He m. (2nd) 27 Feb. 1902 (Ella) May, 4th dau. of Edward Maynard Denny of 1 Bryanston Square, London W1. She d. 29 Jan. 1958. No children (or no surviving children) by either marriage.
It doesn't say what became of Stream Hill. May's youngest sister m. one of William's younger brothers, Kilner Brazier-Creagh -- yes, the various members of the family couldn't agree whether to spell it with an S or a Z.
The present head of the family is descended from a cousin, son of William's father's eldest brother. I wonder whether you'd be able to google up a present-day member of the family, in Co. Cork or England or elsewhere, who would know something? The book was published in 1976, so I doubt many of the postal addresses given would apply now.