Family problems

My sister has always been wishy-washy when it comes to being around my kids. They're almost 4 and 2. I live in a townhouse and her friend lives a couple doors down so we constantly see her walk right past our door. They only time she stops by is for food or a phone charger. My kids constantly scream her name trying to get her attention and she just walks right by. Literally all of her friends and their kids have always come first. This last time was the last straw. She told my kids before she went on a vacation that she would take them to the park and she never showed. The day after she gets home she told me to get them dressed and she'll be back in an hour. I never got them dressed because I know my sister; she called me 4 hours later from her friends house telling me to get them ready. I told her no and that she wasn't allowed to see them anymore because my daughter had cried all day wanting to go to the park with her aunt and I'm not gonna continue to allow her to hurt my child. Of course she called my parents who went off on me because "family is everything" bullshit. Apparently I'm lying about what happened and just a bunch of shit. My youngest sister told me everything that was said so I told my parents that they aren't seeing my kids anymore until they realize that they are grandparents and not their parents. I'm tired of my parenting constantly being openly judged in front of my kids. My parents ask my daughter about what goes on in my house. They tell her that she can live with them and all i have to do is sign papers (custody papers). They don't "love" my kids the same. They only take my daughter places and leave my son at home because "he cries to much". He doesn't he just doesn't know them and he can feel the difference. I've been saying the same stuff for months now and nobody heard me but now I'm a bad person. I live right across the street from my parents and see them maybe once a week. They love video chatting my kids and call that a relationship with them. They grounded my little sister from coming over to my house because they know we have a good relationship; she was here everyday. My kids miss their aunt. They're now talking about my husband because he's standing by me and my decision to cut them off. I'm just so done and over it.