Hi all,
My fiance and I would like to fly in his best man to our wedding because my fiance wasn't able to make it to his wedding. He has friends from all over the world (military upbringing) and it's important to us that at least some of his friends can come so we're going to offer to pay for his ticket.
Does etiquette say we should also pay for his wife's ticket? Either way is doable, I just don't want to A) offend (she is just as important as her husband!), or

overstep any boundaries ("what are we, poor? we can afford our own tickets" sorta thing). I know this sounds SO stupid but I'm just nervous about it for some reason!
Any advice would be great!