Mother of suicide victim says his death was harder to cope with than eldest son ...

The mother of a boy who took his own life years after his brother was killed in a one-punch attack choked back tears while confessing she felt like she 'failed' as a parent.

Kathy and Ralph Kelly lost both of their sons in tragic circumstances and are still searching for answers as to what they could have done to prevent their deaths. 

Stuart, 18, took his own life four years after Thomas, 18, died from a sickening, unprovoked punch during his first night out in Sydney party district Kings Cross. 

In a gut-wrenching appearance on Andrew Denton's Interview on Channel 7, Ms Kelly spoke of how Stuart's death hit her in a different way to the loss of Thomas.  

'What happened to Thomas was a horrendous part of our lives, but he was happy when he died. He was holding a girl's hand, he was going out for a night of fun,' Mrs Kelly said.

'But how did we fail our son (Stuart)? That's what it feels like every day.

'This beautiful boy that was the joy of our lives didn't want to live anymore, and didn't want to talk about it to us.'     

Mrs Kelly revealed how Stuart, who she described as the family 'clown', became introverted after one night at the University of Sydney's St Paul's College in 2016.

The couple believe their youngest son had been the target of bullies at his new school, calling them asking for help the morning after his first night on campus. 

'We drove in, he was sitting in the gutter with his head in his hands,' Mr Kelly said. 

'When he got into the back seat of the car, he started to sob uncontrollably, which was completely out of character for him.

'That was really alarming because he was this young boy, starting the next stage of his life after school and suddenly it had just all completely disappeared.'   

Mr and Mrs Kelly said they heard their

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