Later on this week I'll be attending a book signing event with the author of the Lone Wolf game book series Joe Dever. The event coincides with the publication (whether entirely new or simply refurbished I'm unsure) of the first book in the series translated into Swedish. Being inexperienced with book signings and never having been one for collecting autographs, I would assume the new publication is sold on the spot and signed by Joe shortly thereafter. I believe it to be a smaller event, with an expected head-count of below 30 participants (pretty impressive for a book-series originally conjured in the eighties!).
While a fan myself, having played through Lone Wolf books on several occasions, I'm considering giving the signed copy of the new publication to one of my two siblings; neither have ever been introduced to single-player gamebooks. In the best of worlds, of course, I'd be able to gift a signed copy to the both of them, which brings me to the subject of my question:
Might it be considered rude to purchase two copies at the signing event and ask for both of them to be signed for this purpose?
I'm thinking this is a good place to ask, since I can imagine authors of game- and roleplaying books having a more intimate relationship with their (possibly smaller) fanbase, compared to more mainstream authors and public figures.