You could certainly be honest about your reasons for skipping the reception, but this wedding is not about you. If you want to avoid conflict beforehand, it should be fairly easy for you to attend the reception, congratulate your sister and her husband, participate in the photo session, visit with your own family members and other people you do like, and then quietly exit when the dancing and drinking start.
Subscribe to Updates
Get the latest creative news from FooBar about art, design and business.