Phil,
Not trying to put a damper on your brother in law's enjoyment but...
since he appears to be a racer, could you make sure that he is aware that a trackday is not a race.
I was on a Brands evening the other week and it was full of club racers who hadn't quite grasped the fact that most people were there to have fun...NOT to race and make agressive moves on fellow riders.
I was nearly put onto the grass by somebody nicking my line into Surtees. Whilst I'm sure that type of move is fine during a race, I didn't appreciate it on a trackday!
Anyway...let's all have fun out there tomorrow!
R X