The funerals will take place today of nine-year-old twins Thomas and Paddy O’Driscoll, and their 21-year old brother Jonathan.
The twins were found dead at their home outside Charleville in Co Cork on Thursday afternoon.
Their brother’s body was found in Buttevant shortly afterwards.
It is believed Jonathan stabbed his two brothers before taking his own life.
Requiem mass for all three will take place in Charleville at midday.
The twins will then be buried in the local cemetery.
Jonathan will be buried with his maternal grandparents in nearby Kilmallock.