Pissed.

So I watch my cousins 3 kids, I buy them stuff to eat, and take them places, put gas in the car to pick them up from school. And you know what she tells my sister that my sister shouldn't pay me. My sister watches one of her kids from 11am to 12:05 pm and still gets paid $200+ and I watch them from 2:30pm until 5or 6 pm. so tell me why I shouldn't get paid. If I don't get paid should I stop watching her kids? If she doesn't pay me I will stop watching them! I'm using my free time to watch them. All I'm asking for is $90 a month for 3 kids.