Zane Gbangbola died when floodwater entered the basement of his Thameside family home in Surrey on February 8 last year.
His mum and dad Kye and Nicole have always maintained he was killed by hydrogen cyanide poisoning – released through water which they believe had been contaminated by a former landfill site behind their home, Get Surrey reports.
In a letter addressed to Zane, who was a pupil at St George’s Junior School in Weybridge, Mr Gbangbola details the daily struggle he and Nicole face since the death of their son.
“As I stare at your toys and the places where I used to see you play, my tears fall as my heart breaks from the emptiness,” he wrote.
"Mum cries herself to sleep every night. I dream of us together again and wake up happy, then sad because your not there.
“I see your toothbrush, shoes and look for you. I can’t hear you and I can’t turn back the clock. Your warm hugs, kisses and smile, the sound of your little feet on the landing floor as you come for your morning snuggle with mum and dad, all now just loving memories.”
Mr Gbangbola added: “I miss you so much Zane, from doing your hair and getting you ready to just being your proud dad.”
For the past 12 months, the family, along with campaign group Truth About Zane, has been battling for a more rigorous investigation into the death of Zane and are still waiting for an inquest date to be set.
In the letter, Mr Gbangbola describes how his ‘biggest wish’ is for people to stand up for him, as he did for other people. “I don’t know what most think of your mum and I,” he wrote.
“But I do know what they would think if they lost their child, they would be devastated and want truth. So I ask their conscience to stand up for what is right and show solidarity with a parent in need.
“The authorities knew immediately what had happened, all they need to do is tell the truth. It makes it difficult asking children to tell the truth if certain adults can’t.”
Spelthorne MP Kwasi Kwarteng has met Surrey Chief Constable Lynne Owens to discuss the case.
He said this week: “It’s a huge tragedy and a terrible thing that happened. Words can’t express how sad we feel. As Kye always says, actions are more important.
“We still haven’t got, to my satisfaction, enough on this.”