Nine year old twins Thomas and Patrick O'Driscoll were discovered in their home in Charleville on Thursday evening.
Gardai believe their 21-year-old brother Jonathon stabbed them to death, before taking his own life.
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Requiem mass will be held today at the local 'Holy Cross' Church after which the twins will be buried together in the adjoining cemetery.
Jonathan O'Driscoll will be buried separately at a graveyard in Kilmallock.
