"August, u know, I'm here to save u," the "Anaconda" rapper captioned an Instagram selfie of the two. "still praying for my lil bro. He's doing better."
August followed up by posting what appears to be an older selfie with Nicki, writing: "She has to be the sweetest girl I know. #ASisterThatPrays"
We could all be so lucky to have a 'big sis' like that. Feel better!