Oh I hope I didn't upset you!
Yes, I had 16 people attend my passing out parade; I went through in 2004 and it was encouraged.
What point is he at in his training? It used to be 8 weeks when I went through, but I believe they upped it to 9 to include an air station and submarine visit. I'm not 100% on that.
Are you worried he will struggle with any particular point? How old is he?
From what I remember, week 5 was the biggie. Final fitness test, assault course, major kit inspection where you fold your kit to A4 size (and yes, they check the measurements!) Real bullshit factor comes into play. They used to make you do the assault course the day before, so your overalls and drill boots were fucked. They even pulled apart the seams to check there were no specks!
But it brings you all together as a team, which is the point.
I still am left with fond memories of my training (mostly!) it hardened me up and turned me from a silly, giggling little girl, into a mature, unflappable woman. It will probably be hard for him to fit in with his mates back home again.
Christ, sorry I keep going on and on!