Long story short, my best friend of almost 10 years, who has already accepted my proposal to be my MOH, is now complaining all the time about how she cannot afford to go to Mexico. While I disagree with her spending, and choosing to go to an expensive college, if she cannot go I have to have a back up plan. She is not making saving money a priority. My other best friend, is my mother in law. She is like the mother I never had growing up. As none of my other friends are able to make the trip to Mexico, would it be acceptable to have my mother in law as my MOH? Thank you all for the advice, it has definitely been stressful for me not knowing if my best friend will be able to make the trip.