BAMA tickets problems

My family has a set of tickets that a set of season tickets that have practically been given to me. I have been the one who has used the tickets for the last 15+ years. Three years ago when I gave my sister the tickets to a SEC game (Tennessee)she did not use the seats. However, since this time she has married an Auburn fan and felt the need at a family gathering last Sunday to ask for the Alabama ticket. It is the only game she wants and said she can not make it to any other games. She also did it in front of my entire family who said we should find a fair way to resolve this. I am coming to the rant to find a fair way to resolve this. Any ideas? No pics..


ETA: yes, I know I am lucky and spoiled because my family always lets me use the tickets. It is just the cherry picking concept that bugs me about this.