The jury in the inquest of three brothers who died in Co Cork last September has returned verdicts.
The jury found that 21-year-old Jonathan O'Driscoll took his own life.
In the case of nine-year-old twins Patrick and Thomas, the jurors returned open verdicts.
They had been informed by the coroner, Dr Michael Kennedy, that the option of returning verdicts of unlawful killing was not available to them as the evidence presented today was that Jonathan O’Driscoll was not of a sound mind.
The jury also said that the family had done everything in its power to assist Jonathan before the tragic events of last September.
Afterwards Dr Kennedy spoke of the horror and the awfulness that had been visited on the family and he said that Jonathan O'Driscoll was suffering from a serious psychiatric illness at the time of the deaths.
The boys' mother Helen O'Driscoll said it had been a tragedy which will never leave her.
Jonathan O'Driscoll was fostered when he was only three days old by Thomas and Helen O'Driscoll and later adopted.
He was 13 when Mrs O'Driscoll gave birth to the twins.
The inquest at Mallow Courthouse heard that all three had happy childhoods, with Jonathan being re-assured by his parents that he would always be their first son.
They assured him that he would never be "put down the line", which school children once told him would happen.
Warning: Readers may find some of the following details disturbing
In the years after leaving school Jonathan suffered from depression, but evidence was heard in a statement from his doctor that the events from last September were totally unpredictable.
Mrs O'Driscoll said he loved his brothers and they loved him.
On the afternoon of 4 September, Jonathan was minding the twins at home while some of the family was away.
A neighbour was alerted by a younger brother saying that Jonathan had killed Paddy and Thomas.
When he went into the house he found the twins in downstairs rooms. They had both been stabbed, one up to 40 times.
Jonathan O'Driscoll's body was found just over an hour later, 15km away at Buttevant. He had taken his own life.
The inquest heard he had left two notes, the contents of which were said to be disturbing, but these were not revealed or read out.
Mother gives message to those suffering with depression
Afterwards, Mrs O'Driscoll spoke to reporters and said she had one message for those suffering from depression.
"Well if I had one message, I would give that message out to all the little children, boys and girls ... adults that are out there suffering with depression and sickness ... don't wait for their parents to be sick and broken hearted like us, go and find help.
"No matter what phone you pick up, no matter what friend you tell, there's somebody out there who will listen to you.
Mother of Cork twins calls on people suffering from depression and mental health issues to seek help https://t.co/ejJfWwN20r— RTÉ News (@rtenews) August 19, 2015
Asked if she had any closure now following the inquest, she replied: "I suppose it's a step more for us to get on with life, at least now we know what rightly happened and we know there's no one really to blame really, only the good god up there that wanted them."
She said the family had been broken hearted since the tragedy and every day felt like "a million years," adding that she believed it would be "like that for the rest of our lives."
Mrs O'Driscoll said she hoped no other family would go through what they had endured.
She said the couple had done their best to help John and agreed that mental health services in Ireland needed more resources.