My finance's sister is upset with us because we have started planning (very little, we're going away without family to get married) our "marrymoon" planned for May 2011 before she had her wedding on June 26th 2010. She thinks we're "stealing her thunder" and told us that we should have waited until 2012 to get married, even though we're moving away in 2011. I have continued to help her with all her decorations, invitations, and showers without complaint. Am I being selfish for starting to plan my own travel arrangements?