Sebastian McLoughlin’s (4) health began to deteriorate in January after he began suffering with persistent headaches and vomiting.
He was diagnosed with a brain tumour and his parents say he has but weeks to live.
Conor and Ann McLoughlin - who are from Tipperary - brought Sebastian to the doctor, who broke the devastating news.
"He kept vomiting, especially in the mornings. He was up complaining of headaches from time to time and we were in and out of doctors and in and out of hospitals,” Mr McLoughlin told The Ray D’Arcy Show.
"He was put on to antibiotics, he was put on to different things and nobody really knew what was wrong with him."
Several tests later it was confirmed Sebastian had a cancerous tumour.
Now Conor, his wife and their extended family are looking for any help possible in recreating Sebastian's favourite time of the year - Christmas.
"Sebastian really loves Christmas, like any child, it's his favourite time of the year. He looks forward to it from one end of the year to the other," he told Ray D'Arcy.
In particular they are looking for a sleigh and deers, Santa's grotto and anyone with Minion costumes or anyone willing to dress up as Minions.
Now preparing to give their son his final Christmas Day, the family are appealing for help in securing all the trappings of the celebration.
Anyone who is able to help the McLoughlin family make Saturday special for Sebastian are urged to contact [email protected]