Pierre,

As some have already pointed out, I'd respect the wishes as expressed by the boy's father for the time being.

If the father was my brother, I'd take him aside and determine if this was truly the boy's wish or if he himself had a problem with the kilt. If he was not my brother, I would speak with the mother, and then the boy if necessary, to determine if it was really a problem.

I am often the "wierd" uncle to my nephews and nieces, and they may express embarassment sometimes, but I usually have a conversation with them and they end up seeing things in a similar manner as I do. Mostly, I want my nephews and nieces to understand that bowing to peer pressure is normally the weakest way to deal with an issue.

Good luck,

Matt