When my brother got married, people RSVP'd to my sister-in-law's mother and sister. We are not going to do the response cards because we are having a buffet and I feel like the response cards are a waste of money in our case. My question is, who should we have people call to RSVP? I've heard mixed things. Some people say our guests should RSVP to us, but since my fiance and I are so busy (he works crazy hours right now) would it be wrong to have my side RSVP to my mom and his side RSVP to his mom? Thanks!