Tristan Thompson's role as big brother to Amari has shaped some of the most personal chapters of the NBA player's life. Keep scrolling for what to know about their relationship, including Tristan's guardianship and more: Who Is Tristan Thompson's Brother Amari Thompson? Amari is the youngest of Tristan's three brothers, alongside Dishawn and Daniel. He has Lennox-Gastaut syndrome, a rare and severe form of child-onset epilepsy that causes cognitive impairment and behavior issues. Amari is unable to walk or talk, is confined to a wheelchair and experiences frequent seizures.