On average i am paying him £50 a day that day being from say 9 to 1 or 1.30 but he is only doing ground floor work.
Now, I work that out to between £11.11 to £12.50 per hour. If he can't get motivated on that rate of pay, tell him his job's advertised at the JobCentre and you're interviewing at the end of the week!
Stuff that "blood's thicker than water" malarkey - he's taking the Mick, and you need to realise it.
Don't shoot the messenger - it's called Tough Love.