Police say the teen gunned down his parents Ryan and Elena Callens, age 48 and 49, in their home in Frisco, Texas, about 2am Monday. The 16-year-old, whose name was not released, was prohibited from drinking soda, had all of his online activities monitors and wasn’t allowed to watch any R-rated movies. The PG-13 films he watched were screened to remove sex, violence and other adult content.

• Ryan and Elena Callens, 48 and 49, were killed in their Frisco, Texas, home Monday morning
• Police arrested their 16-year-old son, but have not given a motive
• Neighbors say the teen was the youngest of five children, but was kept out of high school
• Any movies that the teen was allowed to see had to be stripped of violence and other adult content, neighbors say

Shocking: Ryan and Elan Callens, 48 and 49, were killed by their youngest son at…