Palakkad: The family of the 9-year old boy who was stabbed to death by his elder brother Nabeel Ibrahim reported that their accused son got addicted to drugs during his college education at Coimbatore. The information of his addiction was found during an investigation at his college, post murder. Nabeel stabbed his 9-year old brother to death at his house at Naduvattom, near Palakkad earlier this month.