Pat, most things legally come down to the mental capacity to carry out functions. If a contract is formed in a situation where one or more party's are incapacitated, ie, drunk, stoned, some mental handicaps, then the contract is void.

It really depends on how sound of mind your friend's brother is and whether they've been coaxed into the act.

I've done some awful things for beer but Pat, c'mon, I know you haven't said you're going to do it but you're at least thinking about it. If you're 18 just come to England and you can get drunk every day of the week.