Have you tried the alumni records of Universities at Dublin and Edinburgh? They may have records of parentage and home or birth address. Older records at TCD, (Trinity College) Dublin preserve this data. If you e mail
mscripts@tcd.ie they will search the records for you. UCD was founded in 1851. I recall a Roscommon 1840s Surveyor acknowledging the help he received in his survey from a Castlerea, NW Roscommon clerk named (Charles , I think) Brooke. In 1846, a Miss Anne Brooke was the teacher in the Infant School of the 3- level school in Castlerea founded by Lord Mount Sandford, and probably situate on his estate in the town. In 1848- 54 Oran , the next parish SE of Castlerea, John Brooke has something in the region of 150 acres rented from Augusta B. Daly. It is not clear if this farm contains a dwelling house.