Should i call dcfs on my sister?

It's hard, I know. I've been in your shoes, and it sucks. My cousin was the same way. Roaches, Dog feces on the kids beds, Random men using drugs in the basement, Loaded guns found under 4 feet tall piles of clothes. 8year old kids had been employed as baby-sitters. I knew a woman that worked in childrens services. She reported her and sent someone else. The first time it was a warning. My cousin called me, she always was dependent on my help, as I was the only one who would even try anymore. I did what you and other family have done. I cleaned the crap, the literal crap, bought food, took them home to bathe them, washed the clothes, all of it. But I learned that that idea just band-aided the problem. As soon as they had checked the house it would go back to the way it was. I kept calling anybody who would listen and eventually someone listened. When the police came in, one officer was brought to tears. He walked upstairs and found children's footprints made in dog feces. My great aunt took custody and my cousin got lots of help. It took about five years but she is okay now and three of her kids went back .T he oldest daughter however is permanently traumatized and has a hard time having a relationship with her mom. You have to be a voice for these kids. They don't have one. It is hard and you probably will be riddled with guilt but you have to stand up for them. If they remove her kids your family members can take temporary custody and I believe you can get some help with expenses. Even if they have to be split up temporarily it is better than what they are going through now. I wish you the best. Call the police, skip all the people who don't listen and save these kids. Good luck, my thoughts are with you.