What's my obligation here?

Hi, Long time reader, first time poster here.

      I have been a nanny for four years but out of work for three months before I got hired here eight weeks ago. I finally found a job worth getting out of bed for. I make the kind of pay you upper east side bitches want to pretend that upper west side ladies aren't paying out. I don't know how I could legally make as much money as I'm making. Are you getting that I don't just want any advice but the kind of advice that is going to help me keep my job?

    So the DC I care for are under five. The father is older and has older children from a previous marriage. He is pleasant, but aloof, and keeps long hours. Boss Lady is close to my age, runway gorgeous and down to earth. She is a stay at home Mom, but very busy and an entrepreneur. The older children are all over 18, so they come by from time to time because they all go to school in the city. One of the kids, the middle child, comes over often. I know sometimes one or two of the adult kids will stay for the weekend. They have rooms for this and both parents and the children I nanny for seem happy to see the kids.

     The problem is this older sibling. He pops in all the time. Sometimes he pops in between classes and because of the ages of the DC, we are often home. He always pops in and plays with the kids a bit. He's not unpleasant. But, he does always eat here. He loves to come and make sandwiches. And he doesn't clean up after himself. It's bad. He leaves a mess everywhere he goes. It's not my job to clean up after anyone but myself and the children when I make lunch for them. I started cleaning up after this kid because I didn't want to leave the messes for my employers. And of course, there is downtime in the day and I have the time to clean it up, especially since the kitchen is the central part of the house, and seeing his mess would be unavoidable. I haven't been here that long but he is starting to bug me. One of the reasons I clean up after him is that I don't want the parents to think that the mess was left by someone else. Now, the mother knows he comes by (but I don't think how often). She has cleaned up after his messes. I have noticed that he also takes food with him when he leaves. I don't understand why because cant believe he lives like a regular college student.
    Sometimes he will take things like fresh jellies, cupcakes, bread. Other times he will take mustards, meats, even frozen steaks. He takes coffee because they have a specialty coffee system. I love the coffee machine. But I feel like if he's sneaking off with ten cartridges in his duffel, then I can't have two cups in a day. I want the parents to know that it isn't me eating all of this food. Some of the stuff he takes isn't even food, it's like laundry soap or Clorox wipes or ski goggles. I would rather clean up after him if I could just out this kid for all the food he is eating. I work a nine hour day and I am afraid to eat any food because what if they think all that is gone is food I have eaten? I've even seen him grab subway tokens and a ten dollar bill from the jar where my boss leaves petty cash. That's another thing, she told me when she hired me that she would always make sure there was plenty of cash in this particular jar and I should "just try to get receipts when possible". I make sure it is possible. I always get receipts, but what if they think money is missing? I feel I'm damned if I do say something and damned if I don't. There are lots of times I am out with the kids, so what worries me even more is what he takes when I am not there!

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Check out Living in Your Parent's Basement is Ruining Their Retirement.