According to Grant Williams, Jaylen Brown and Jayson Tatum were cool. The former Boston Celtics big man was asked about Brown and Tatum's relationship on SiriusXM NBA Radio. MORE: We Now Know How Jaylen Brown Really Feels After Shocking Celtics-76ers TradeThe No. He was a rookie when Tatum earned his first All-Star selection and a sophomore when Brown earned his first All-Star nod. Even so, this probably won't be the last time someone weighs in on Brown and Tatum's relationship.