Jack was six when he died earlier this month, two years after being diagnosed with a brain tumour.
He won many admirers though his family's fundraising for others in a similar situation.
He was also taken to heart by sports players such as Serena Williams - who invited him to join her behind the scenes at Wimbledon - Manchester United's first-team squad and the England midfielder Jack Wilshere, who was a regular visitor to his Scunthorpe home and attended his funeral last week.
The Jack Marshall Brain Tumour fund has raised more than £20,000. To donate click here