Andrew McGinley has called for changes to be made to Ireland's Mental Health Act - claiming that his children "would most certainly be alive" if his recommendations had been in place.
Conor, nine, Darragh, seven, and Carla, three - were all suffocated to death in January 2020 by Deirdre Morley - their mum and Andrew’s wife - who was found not guilty of murder by reason of insanity.
It was Andrew who found their bodies in their Dublin family home after returning from work.
Read more: Andrew McGinley's heart-breaking update as grieving father fills out 'lonely' Census form
And he took to the 'Conor's Clips' Twitter account on Thursday to write an open letter, co-signed by Una Butler, who lost her daughters Zoe and Ella when they were killed by their father John.
The pair are seeking family inclusion at all stages of a patient's mental health care.
In the letter, they say: “Based on our own experiences, Una Butler and I have campaigned to seek changes to the Mental Health Act. Had our proposed changes been in place then, Conor, Darragh and Carla would most certainly be alive today as would Una's daughters Zoe and Ella."
They added that patients are being left to "suffer" as the Policy "stagnates".
Continuing, the letter reads: "The vast majority of the College of Psychiatry is in favour of family inclusion and advocacy.
"We are seeking that the current recommendation to proactively encourage a patient to include their family/advocate is written into the Act and is practised at every opportunity with the patient.
"Sharing the vision, Ireland’s national Mental Health Policy, clearly states that there is a role for family, carers and supporters in a person's care and treatment. Recommendations and policy are worthless unless practised.
"The Act needs to clearly define when patient confidentiality is broken.
“Current confidentiality may be broken if the patient is considered a danger to themselves or others. It should not be left to a clinician’s opinion."
Andrew and Una concluded: “The abilities of an ill mind to make considerations, create responses and finalise decisions cannot be relied upon. Everything in relation to a patient should have a collective and inclusive approach from the clinicians, the patient and those there to support them.
“The consequences to the patient on having to make a decision alone is not currently considered.
“It’s too late for Conor, Darragh, Carla, Zoe and Ella. Please join us and contact your elected representative to help make change now."
