When Liam Donnelly's dad didn't come home one night the 7-year-old and his sister thought he was just playing a game.

The previous week the children had been playing hide and seek with him and he'd hidden in the walk-in-wardrobe, so this time they knew just where to look.

"Me and my sister ran there and said 'found ya'... [but] he wasn't there."

Fast forward 15 years and Liam is still looking for his father Jim Donnelly. So is his sister Siobhan and their mother Tracey.

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It's something that has haunted the family ever since and they are desperate for