Perth mum's heart-wrenching wish: 'I want my son to die.'

A Perth mother has written an agonizing blog post  admitting she wishes her cancer-riddled son would die.

Mother Isabella Darch says death would relieve her son of the constant pain he has battled since he was diagnosed with an aggressive brain cancer at four months.

Darch says that her son, Bede, was given only weeks to live but has defied the odds to reach his third birthday.

The incredible feat to beat doctors’ expectations may be a victory for the family but Darch reveals her true wish is to relieve him of pain.

“Because the truth is I want my son to die,” she said.

“I’m tired. He is tired. I want peace for him, rest.”

Bede has undergone 9 months of intense chemotherapy in an effort to extend his time, but his quality of life is heart-wrenching.

Bede is blind and cannot speak. His central nervous system operates so poorly that Bede is left desperate: screaming, hitting his head and needing medication.

"He will have no more growth, no more moments tenderly reaching out to his brother, laying next to his sister," she said.

"He wont squawk away at his dad anymore, he won’t let me kiss him in the way only I can."

"Life is hard but death seems worse."

Darch's strength in admission is echoed by the family's constant battle to remain grateful in the face of horrific circumstance.

"We go on trying to be present, trying to soak in every single moment, utterly mindful of how precious each one is while we spend sunny Saturday afternoons choosing toddler sized coffins that would never, could never hold all that our son is," she said.

Results shared on Bede's crowdfunding page, operated by GoFundMe, predict the toddler does not have long to live.

The latest scans show his cancer is progressing and though Bede is living proof of having defied the odds, the outlook is not good.

Darch shared how even steps backwards in the toddler's health allow for small victories.

"Bede has grown more in the last few months than he has in the past few years and I am reminded that often despite the agitation, Bede is the fullest version of himself when his tumour is growing," she said.

"He is laughing fuller and deeper than ever before unable to catch his breath as the giggles pour out of him."

Bede's family have set up a website for those interested in following his life and story.

The crowdfunding campaign is yet to reach 20 per cent of its overall goal.