Stephen, from Burntwood in Staffordshire, died in May last year after raising £5 million for the Teenage Cancer Trust.
The 19-year-old used social media to chart his three-year battle against cancer.
His family have attempted to set a new record for tandem parachute jumps within 24 hours at a single venue and will find out whether it has beaten the current world record this evening.
Video courtesy of Hibalstow Airfield:
The jump was No. 2 on Stephen's bucket list.
No.1 was to raise £10,000 for the Teenage Cancer Trust and it was smashed earlier today reaching £1 million.