Four years ago 11-year-old Harry Whitlam was knocked down and killed at a farm in Rothwell.
The man who was driving the tractor that took the boy's life was drunk but couldn't be prosecuted for drink-driving, as it happened on private land.
He did go to jail for 16 months and two weeks under health and safety legislation, rather than road traffic law.
There's a debate in parliament later about a possible change in the law and Harry's mother Pamela wants to see this legal loop-hole closed:
Elmet and Rothwell MP Alec Shelbrooke will lead a House of Commons adjournment debate on this subject and told me why he's helping the family: