Heartless trolls have mocked a terminally ill three-year-old who was born with severe disabilities.

Jenny Smith, from rural Ranburne, Alabama set up a special Facebook page in honour of her son Grayson Kole.

Grayson suffers from a number of illnesses including epilepsy, apnea and protrusions of brain tissue through his skull.

Three-year-old Grayson with his mother Jenny and father Kendyl. Heartless trolls have mocked the youngster who has severe disabilities

His terminal disabilities are hydrocephalus (water on the brain) chiari malformation, and craniosynostosis (malformation of the skull).

But he defied doctors predictions by surviving his first few weeks and now Mrs Smith and her husband Kendyl update the Facebook page with his progress.

However, last month Mrs Smith noticed a cruel meme featuring her son's picture appearing online.

It is believed to have been circling since May but was only discovered by the couple last month.

The meme showed a picture of Grayson holding a pumpkin at Halloween and was given the caption: 'That face you make when your parents are actually cousins.'

Grayson suffers from a number of illnesses including epilepsy, apnea, a heart defect and protrusions of brain tissue through his skull but is still a happy little boy

And now Mrs Smith has spoken of her anger after seeing the mocking memes and says she can't believe people would use a child to create jokes.

She told WREG: 'I just can't believe that there are people out there would use a child, especially anyone who has been ruled terminally disabled like that.

Some people think it’s funny, but I don’t find humour in hurting someone else for a laugh. Honestly, I’m just so ashamed that people actually find it to be entertaining. It’s disgusting.'

On the Facebook page, Grayson's parents write how they discovered at birth that their son was ill when he was born in 2013.

Just hours after being born, he was rushed to a children's hospital in Atlanta and his mother and father were told to prepare for the worst.

However, he managed to defy doctors and has so far undergone 24 operations including having go shunts fitted to keep him alive and maintain his quality of life.

When the meme emerged online, Grayson's parents initially considered shutting down the page.

Grayson with his mother, left, and father, right. They have defiantly kept open his Facebook page and also posted a message online aimed at the cruel trolls

But they defiantly kept it open and also posted a message online aimed at the cruel trolls.

It read: 'Thank you to those who chose to take our sons picture and make cruel comments about him and share with several cruel sites.

'Grayson is his own little star that shines so bright and you have just made our day by giving him the blessing for this opportunity to share with more people about his special life and help spread awareness for him and other special children and families like him and us!

'So your cruelty just became Gods way of showing his glory yet again! As Grayson says "booyah".'