I have never asked her to watch them before so it's not like I'm taking advantage of her all the time. And like I mentioned my parents would totally help out. DH and I never get to go anywhere cuz we either can't afford it or can't afford to pay a sitter and we never had a honeymoon and we are going on 7 years. If my sister offered to pay me to watch her kids years ago all the times I did, I would have jumped at the chance for ANY money but I watched them for free and was happy to do it for free cuz that's what familys about, helping each other out.
gosh like I said above I have no idea since I have never had to pay someone to watch my kids and you guys are making me feel bad, which isn't too cool.