Amar'e Stoudemire's younger brother was arrested in Kansas Monday night -- after allegedly kidnapping the mother of his child, repeatedly beating her and then locking her in a basement ... TMZ Sports has learned.
Law enforcement sources confirm ... 28-year-old Jerrel Stoudemire -- a former college football player -- was taken into custody around 5:30 PM in Hodgeman County, KS.
We're told ... officials believe Stoudemire went to the woman's home and waited for her to arrive. When she pulled up, he rammed his car into her vehicle .