S1·E670 Khoon Ka Rishta

Some kids are seen playing in their locality late in the evening, just then they hear a scream from a balcony of a house and they decide to go check the place. They see a man, Abhimanyu holding a knife over his sister's dead body. Upon being startled by the kids he gets scared and runs away. When CID reaches the crime scene, they are informed that both brother and sister were not in good terms. Did Abhimanyu really killed his sister? Or is he being framed?