Ask the parents to leave you a schedule for the evening. It will indicate if the boys need to shower or bathe. My six year old showers by himself, so I would imagine a seven year old could as well. You’ll also know what time they should go to bed, what they need to do for chores, etc.
Whenever I babysat, the parents would either have dinner ready or have some simple thing for me to make. If you want to be hired for future babysitting jobs, make sure you clean up from dinner. Put the dishes in the dishwasher, clean the pots and pans, and wipe up any spills or crumbs. The parents will really appreciate that, even if they tell you not to worry about cleaning up. You can also make sure the boys clean up after themselves.
As far as entertainment goes, ask the parents what the boys are allowed to do. They may have limits on TV or video games, or may be expected to read before going to bed. If the mom and dad say just to have fun, throw in a movie and make some popcorn. Play board games with them. If they really just want to play with each other, stay nearby and supervise. Don’t talk on the phone with your friends or invite anyone over, no matter what!
One of the hardest things might be to get the kids to see you as being in charge, not just being there to play with. Be firm, and explain that you can have a good time if they agree to listen and follow the house rules. Be clear that any problems will be reported to the parents. Other than that, use common sense. If they are fighting over a toy or game, give them five minutes to work it out peacefully. If they can’t, take away whatever they are fighting over. Send them to their rooms if they can’t behave or won’t listen to you.
I’m sure if there’s anything you need to do for the dog, they’ll also tell you that. I’d hope that the oldest child at least would be responsible for pet care, but if not, they’ll leave you with instructions. Make sure they also leave you important phone numbers, like their cell numbers and their doctor’s number. It might be helpful if they give you the number of a family member in the area in case you can’t reach them.
If all else fails, call in your parents for back-up. When I first started babysitting, sometimes I would call my mom with a question. The kids are old enough to tell you what they want to do, and you’re old enough to tell if they are lying. If they say they are allowed to play on the roof, I’m sure you’ll know that’s not true.