Mailing them back as their presents next year might be an option...they probably wouldn't notice! Oh, and believe me, the charity shops have done quite well by my family.
Return is expensive because of the transatlantic thing. I think I'll have to go for the blunt approach and just confess to having different tastes...
Makes me think, though-- it's funny how family members think they know each other so well but actually pay very little attention to each other.