Is it normal that i want my vacation to be over?

I'm on vacation in the Dominican Republic. I was hoping I would at least have a normal time with a few fun days in between. So far, I have only been on two real outings. One time I went to the river and the other time I went to the movies. The main problem is not the lack if entertainment though. The real problem is my little sister's behavior and the grandmother's pettiness. My little sister has been a pain in the butt throughout this entire vacation so far. Some days are better than others. I try to take things calmly and correct my little sister, but the progress that I'm making with her is slow. The only time she behaves better is when she is laying in a separate room by herself and is using her phone. Basically, when no one is telling her to do something, she doesn't retaliate. As far as the situation with her grandmother, it hasn't always been easy. The grandma is the type to complain about any little thing, even if it's just a few pieces of paper on the floor or even where people put their suitcases. Whenever my little sister cries and I'm in the same room with her, the grandma thinks I'm hitting her (but I'm not because I refrain from doing that). This has been a trip from hell so far, but I am thankful that I literally already spent half of the time here. We are staying here for 36 days, but 18 of those days are already out of the way, so I'm hanging in there. Yes, I'm literally counting down the days until I leave, which is why I wonder if it's normal for me to want my vacation to be over.