The father of a Co Armagh man, believed to have been abducted by the IRA earlier this year, said it would be "pure torture" to experience a 31-year wait like that of the McConville family.
Mark O'Connor said that at 45 years old, he does not know if he will still be alive in three decades to see his son Gareth returned home.
Mr O'Connor's comments came as it looked increasingly likely that the McConville family have come to the end of their wait to find the remains of their mother, Jean.
On Wednesday a man out walking with his children found human remains on Shelling Hill beach in Carlingford, Co Louth.
Mrs McConville, a widow, was abducted from her home by the IRA in December 1972 and secretly buried, leaving 10 children orphaned.
In May 2003 Gareth O'Connor is believed to have faced a similar fate after failing to report to Dundalk Garda station as part of his bail conditions.
He has not been found, despite searches on both sides of the border.
It is understood that prior to Mr O'Connor's disappearance, police had warned his family that the IRA may be targeting him – an allegation the IRA has consistently denied.
Mr O'Connor said he wishes his family's nightmare was also at an end.
"I feel great relief for the McConville family, and I hope that they can put this event behind them and get on with their lives. I am sad that they had to wait 31 years to finally get their mother back.
"I'm 45 years old, so I don't know if I can wait 31 years to get my son back, I don't know if I would be here then, if that is the time I will have to wait to get Gareth back," Mr O'Connor said.
"Are we going to die without knowing what happened to Gareth? It's pure torture.
"We don't know, but the IRA does.
"Gareth is definitely one of the Disappeared, he got the threat from the Provisional IRA on the 8th of May and he went missing on the 11th May.
"For the IRA to say nothing is complete hypocrisy – they know what happened.
"I would ask the McConville's if there is anything that they could tell us to help us, we would be more than grateful.
'I feel sorry that they have had to go through this, but I am glad that have now got a body to bury, and a place to mourn their mother but we haven't got that," he said.
Meanwhile, Margaret McKinney, whose son Brian's remains were discovered in 1999 after he was abducted almost 30 years previously, said that her "prayers have been answered", by the news that Jean McConville might have been found.
"My message to the McConville family is that I know the next few months are going to be hard for you, but it will pass.
"You will be like me. The time will come when you will be able to go to your mother's grave, to bring flowers, to keep it nice, all the things she would have wanted herself," Mrs McKinney said.
