Sibling MOOCHING off my parents

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A year ago, my sister (she's married with 2 children still in her care) moved in with my parents. She told them they'd only be there for a month. Now, she's telling other people that she's taking care of my parents and paying their bills. This is completely false, I know this because my parents have had to borrow money from me to pay the bills. She's also the oldest, and I'm the youngest. My parents are in their 60's. I don't think they should be as stressed as they are about having to take care of so many people. They raised their 4 kids, and most of us are capable of taking care of ourselves, but apparently everytime my sister gets married, she forgets how to do that. I almost feel as if she's trying to stress them to death to get their house. I'm not exactly sure what I can do to help the situation. I've tried to help my sister find a house, I've tried to subtly tell her she needs to get her and her family a place to live, and I have very bluntly told her that a 40 year old woman, who is married, and has children should not be mooching off of her parents. I have also recommended, that since she's not saving up any money from their paychecks, that she hand some of that over to my parents to really help them out, instead of lying to other people about it. I'm open for other ideas too. My parents are just too nice for their own good, and I have repeatedly told them that they need to kick my sister and her family out. But they refuse to leave their grandkids without a home. They don't think my sister would get them a place to live, even if they were kicked out.