Jontay Porter will reclassify for the class of 2018 to join his brother, Michael Porter Jr., at Missouri.
The Porters' father, Michael Porter Sr., is an assistant coach at Missouri.
"This is going to be a special year for Mizzou basketball, and I couldn't pass up on this opportunity to be a part of it," Jontay Porter told ESPN on Wednesday. "Playing with Michael was definitely one of the most attractive things about reclassifying. Every team we've played on together has had major success, so hopefully that trend continues."
There is little more than a year in age difference between the brothers.
Jontay Porter was the 10th ranked player in the incoming class of 2018.