My great uncle Patrick Mulligan died in 1918 at the age of six from Pott's Disease. My grandmother, Mary, had one sister(Anne), and two surviving brothers(John and James). They lived in and around the Harolds Cross area, with my great grandfather Mulligan working for Byrne's Dairy at 274 Harolds Cross Road. The building is still there, but it's now an Indian take away with a print shop where the stables were.
I've hit a brick wall with my great grandfather Mulligan's line, although I managed to trace the Brennan line back to Dublin in 1744.