Colin and Wendy Parry’s son Tim died while buying a Mother’s Day card along with three-year-old Johnathan Ball when a bomb was set off Warrington in 1993.
The story is told in new BBC drama 'Mother's Day' stars Daniel Mays and Anna Maxwell Martin.
The couple revealed how they co-operated with the programme's producers, by sending them home videos.
But the re-enactment of the terrible day has been hard for the couple to watch.
“To watch the bomb go off was shocking,” Colin, 71, told the Mirror.
“The idea that after the first bomb Tim staggered around dazed and walks into the second one is horrifying.
“It was difficult to watch as you’re thinking that’s what your own son went through."
Tim died in his mother's arms in hospital when his life support was turned off five days after the bombing.
“The time in hospital, that was played very well. Danny and Anna were great. Anna captured Wendy absolutely brilliantly.
“We didn’t meet them before but they watched interviews we gave at the time and we handed over home videos.
"It sat well with our everlasting desire to keep Tim alive.”
The couple have two grown up children, Abbi and Dom, and Colin said the family still talk about Tim at the dinner table and when on holiday.
“The biggest, most emotional days are his birthday, Christmas and the anniversary of the day he died. We never forget Tim.”
Wendy, 61 added: “We have four grandchildren now who talk about Tim as though they knew him.
“We talk about him like he’s still here.
“A month ago our grand-daughter was given the Tim Parry Trophy. We didn’t know the school had a trophy named after him. That was terrific.”
'Mother's Day' also depicts the role of Susan McHugh who organised rallies in Dublin for peace in Northern Ireland and against the IRA following the bombing.
The IRA attack, and the death of Tim and Johnathan, became a key moment in the Northern Ireland peace process.
It also took the Parrys to the province, where Mr Parry said his experiences filming a documentary there inspired him to set up a foundation for peace.
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