Toby was Kate and Brent Cockbain's first child

Toby was diagnosed at 10 months and seemed to be recovering before a relapse three months ago.

The Neath-Swansea Ospreys player and his wife Kate are to hold a dinner to raise money for children's cancer charity Latch.

The Australian-born lock said it was "hard to put into words" how it felt to lose a child.

Toby's brain tumour was diagnosed after his mother noticed a change in him.

"We were devastated but we had fantastic support from friends and family," said Cockbain, who has won 14 caps for Wales since making his debut in 2003.

It's usually the times when you're by yourself and things are quiet that you think of it Brent Cockbain

"It was one of the hardest things we have had to do in our lives, to try to come to grips with it."

The couple saw their first child go through surgery to remove the growth, followed by chemotherapy, after which he seemed to improve.

But the tumour began to regrow just after his first birthday and he died at the family's Cardiff home within a week.

"There was always a chance of it reoccurring and when it did, it was really a worst case scenario for all of us," said the player.

"We didn't really have too much time to spend with him after that, which was very sad.

Toby Cockbain died three months after being diagnosed with cancer

"It's very difficult (to lose a child), it's hard to put into words.

"It's usually the times when you're by yourself and things are quiet that you think of it, it catches you out.

"I suppose that part of that, time will make it easier, but part of that will be always with us."

A host of famous names are expected to be at the couple's fundraising dinner in early March, including former England rugby coach Sir Clive Woodward.

They hope their efforts will help other families cope with the serious illness or death of a child.

"We want to raise money for Latch because they helped us emotionally during the time, organised a few things as well for us and Toby," said Cockbain.