Bikaner, Nov. 12 -- Three teenaged siblings and their 21-year-old cousin drowned in a water tank on an agricultural field in Bikaner district of Rajasthan on Wednesday, police said. Khajuwala circle officer Vijaypal Yadav said the incident took place around 12.15 pm at Chak 9 AWM, under the jurisdiction of Chhatargarh police station. The deceased, identified as Pooja (14), her two elder brothers Mukesh (16) and Manoj (18), and their cousin Nirmal Nayak, lived at a hamlet near the water tank, he added. According to people familiar with the matter, Pooja went to the tank to fetch water for daily household chores around noon. While drawing water, she slipped and fell into the tank. Yadav said Mukesh and Manoj,who could not swim, entered the ta...