Wow that's too bad about the dogs!! I heard beagles are very hard to handle and often end up at the humane society for behavior problems. If your sister can afford to go on vacation, she can afford boarding her dogs. I thought for sure you were the youngest - maybe they think because you're the oldest, you're expected to do the impossible. How long are the dogs going to stay with you? If it's too long maybe you should board them and she can pay later lol. In the future learning how to say "no" will be the greatest gift, you give yourself.