Some context: My dad started his own business about a decade ago and it took off. By consequence, he makes a lot of money but is often working 60+ hours a week.  
My mom has taken this as an opportunity to stay home. She hasn't worked in years, doing about 2-3 hours of volunteer work a week.  
I'm a student in my junior year of high school taking advanced classes. Between school and homework, it's about 50 hours a week, plus about 10 hours of extracurriculars. As a result, I value my vacation time enormously, as it is the rare opportunity to relax.  
We are comfortably upper-middle-class to rich. We could afford a house cleaner easily. However, my mom says that's elitist and every family should be able to clean their own house.  
I think that, because she is home the vast majority of the time, I am nearly independent, and she made the choice not to hire a house cleaner, she should do all the housework. She argues that since I live in the house, I should do my equal share. When I help, she acts like it was my responsibility. I believe she should see this as a favor from me.  
I am on vacation this week, and so she expects me to do a significant amount of chores (about 5 hours' worth over the next two days) while she rests. I understand she does the housework normally and deserves a vacation also, but I think that's her job and if she doesn't like it, she should get my dad to pay me or a house cleaning service. If nothing else, I think she should be far more grateful than she's been. However, I've been told that housework is far more exhausting than a kid could understand. So, AITA for thinking this way?  
TLDR: SAHM is the only one who's home often and she says house cleaning services are elitist. She expects me to do part of the housework. I don't think this is my responsibility—if I do it, it's a favor. AITA?