A mother has shared a heartbreaking photo highlighting the devastating impact cancer has on families.

Ally Parker's five-year-old daughter is fighting a losing battle against an aggressive form of brain cancer, while her father is terminally-ill with a motor neuron disease.

The mother from Florida now faces the grim prospect of having to bury both her daughter and father within weeks of each other.

So she uploaded a gut-wrenching photo to Facebook on Sunday showing her father, Sean Peterson, wailing by his granddaughter's hospital bed.

The sheer expression of agony on his face conveys a pain the whole family is forced to endure.

A mother in Florida is trying to raise awareness for her terminally ill daughter by posting a photograph of her father wailing next to her hospital bed

Braylynn Lawhon was diagnosed with Diffuse Intrinsic Pontine Glioma - the most deadly form of brain cancer - on December 6

On December 6, Braylynn Lawhon was diagnosed with Diffuse Intrinsic Pontine Glioma - the most deadly form of brain cancer which has no cure and no survival rate, according to The Daily Advertiser.

Parker now faces the bleak reality of losing her both her daughter and her father in the coming weeks

And her condition has deteriorated as doctors battle to treat her illness.

Parker posted about the little girl's plight in a bid to raise awareness.

'We all thought that they would outlive the rest of us...and we certainly never thought that my precious little Braylynn would be the first to go,' Parker wrote in her Facebook post.

'Last year was hard for us, but I can't even begin to explain how difficult this year will be and has already been.

'In a few days I will have to bury this beautiful little girl. Months, maybe even weeks, later, I will have to bury my father.'

'Both of my heroes, gone, within the same year,' she continues. 'How could this happen to us? What did any of us do to deserve THIS?

'Why do they have to leave us? What are we supposed to do? I refuse to believe that there is a reason for this. This world is a terrible place.'

The Pensacola family was given a glimmer of hope after hearing about revolutionary experimental treatment in Mexico.

The family, from Pensacola, Florida, was given a glimmer of hope after hearing about revolutionary experimental treatment in Mexico

They are currently collecting donations via a GoFundMe page that seeks to raise $300,000 for the procedures

'These kids deserve so much more than that, someday soon someone needs to find out what that cure is,' Alley Parker wrote in a Facebook post this week

They are currently collecting donations via a GoFundMe page that seeks to raise $300,000 for the procedures.

The treatment, not covered by insurance, cost nearly $30,000 a round, and due to the aggressive nature of this cancer, several rounds are needed for success, The Advertiser reported.

The treatment, not covered by insurance, cost nearly $30,000 a round (Pictured: Sean (R) and Tracey (M) Peterson along with Bralynn Lawhon)

'Braylynn is still here. Pulse is still strong. Vitals are still normal,' Parker wrote on Monday.

'It may take a few days, because everything is going to be PERFECT for her big day. Until then, she is still with us, still fighting, still strong.'

Parker says she is now determined to raise awareness for and funding for DIPG, setting up a Facebook page called Braylynn's Battalion.

'My baby girl deserves to live a full, happy life, and so does every other child who has had to face DIPG,' Parker writes on the social media site.

'We have to put an end to this. No more kids can get this disease and be allowed to die from it. We HAVE to find a cure, not a damn band aid. These kids deserve so much more than that, someday soon someone needs to find out what that cure is.'

Parker says she hopes the photo can raise awareness about her daughter's condition