THE firearms found at the O'Sullivan farm in Kanturk will be examined today to establish how many of them were used in yesterday morning's murder suicide.
The family legally owned three weapons.
It is understood that they were all taken from the farm yesterday by gardaí for a ballistics examination.
They, along with the post mortem examinations of 59-year-old Tadgh, 25-year-old Mark and 22-year-old Diarmuid, will help determine who and how many people fired the fatal shots.
Gardai are not looking for anyone else in connection with the incident, which kicked off before 6.30am yesterday morning.
The post mortem examinations will get underway at Cork University Hospital today.
The assistant State Pathologist, Dr Margaret Bolster, attended the O'Sullivan's farm at Assolas, between Kanturk and Castlemagner yesterday evening, to view the bodies at the two locations where the men were found.
Mark was found dead in his bedroom, while Diarmuid and Tadgh were found in a field a short distance from the family home.
Mark and Diarmuid's mother Ann raised the alarm yesterday morning when she went to a neighbour's home.