Mother of the year

There is one weekend a year when bio mom and bio dad can be guaranteed to have their kids--Mother's Day and Father's Day. So then how in the world can bio mom possibly "forget" she would have them and schedule an out-of-town trip on Mother's Day? Are you kidding me? We've had a trip planned for months, because we knew we had no obligations that weekend. Then 2 weeks before, stepdad emails us to ask if we want the kids that weekend. I'm like, Seriously?? I would die to actually have them on Mother's Day! It's a once-in-a-lifetime opportunity. Too bad our Mexico trip is non-refundable. So they have to stay with friends or stepdad's mom--which they are not thrilled about. All the griping and whining that bio mom does that she misses her kids and doesn't see them enough--and then she plans to be away the one weekend a year that is set aside for moms to be with their kids. Unbelievable. Mother of the year award for her, please.