Do your parents tend your children for you?

Okay. My five children and I are VERY temporarily living with my parents ( my house will be ready on the 15th of Feb.), and they are making me insane! I'm not allowed to parent my own children! Mom and Dad will talk over me in any given situation ("Did you do your homework?" I'll ask, and Mom will be like, all indignant and start bossing the kids around "get ready for your baths, clear your dishes off the table") and undermine any efforts I make to be the Mommy. The kids are getting really confused about who they should be listening to, and I don't blame them. I've tried talking to my parents about this, and got the standard " As long as you are in my house, you will follow MY rules" speech.. but does that really apply here? Advice very much appreciated. I WANT TO BE THE MOMMY FOR MY KIDS!!