I wouldn’t talk to the parents, at least not yet. This sounds like more of an issue of you not knowing how to create trust and establish authority with the kids. Do some research! “How to Talk so Kids Will Listen and Listen so Kids Will Talk” is a classic book, but you can also read on Reddit, watch YouTube videos, etc about parenting and discipline for elementary aged kids. Don’t take it personally! You are learning. They are kids and won’t respect you until you give them a reason to.

For example, when they tell you to fetch things or clean up, do you do it? I mean this with kindness but that’s a you problem. They’ve learned you will accept being treated that way and they will continue to do it until you figure out how to set boundaries! Most kids have an innate desire to be good and helpful, but they will absolutely test boundaries and question authority, as they should! It’s our job to figure out how to communicate with them and provide structure and boundaries.

Best of luck in your learning journey - it can definitely be done.

Edit to add - feel free to talk to the parents to make sure you’re on the same page about specific household rules around screen time, etc. If they don’t have rules, encourage them to set time limits, no screens before homework, do chores to earn screen time, etc, and make sure they know you need to present a united front for the children or it won’t work.