The mother, identified as Victoria Sahayarani, told cops that she intentionally poisoned the 13-year-old boy because he performed better than her daughter in class.
The video, sourced from the Indian Army, captured the three terrorists walking using a long shot lens from behind what appears to be a line of pine trees.
Kannika Kamton, 25, is reported to have approached the holidaymaker on an open-back bus in Thailand and before the man could react, the intoxicated prostitute attacked him.