An orthopaedic doctor allegedly killed his wife, mother, and two children before dying by suicide at his home at Gurunanak Colony in Vijayawada on Tuesday. Police assume that the doctor's extreme action was motivated by financial problems. Darawath Srinivas (40), their two children Sailaja (9), Srihan (6), his wife Usha Rani (36), and his mother Ramanamma (65), have all died.