It happened in the 3800 block of E Ross Pkwy. at around 1:20 a.m.
Two brothers, a 15-year-old and a 20-year-old, were playing video games when the 15-year-old became angry and pulled out a knife.
Police say the teen held the knife to his brother's throat and threatened to cut off his genitals.
The teen was arrested on charges of aggravated assault and criminal threats.
I guess we all have gone through this... can't count how many times my brother tried to cut off my testicles.