Two Nieces in foster care? I need some advice please!! Sorry but it's a long story...?

Their mother isn't capable of caring for her children, period. Whether it's something that happens in the future remains to be seen. The aunt caring for the children isn't making the best choices for their safety, that child could have died from alcohol poisoning. Call social services, let them know you'd like to take your nieces/nephews long term and keep them informed about what's going on with your family. You do not want these children in foster care, you know the best place for them is in your home, so make sure nothing bad happens and get them where you know they're safe.