Stefon Diggs clearly isn't trying to put any distance between himself and his brother, Darez ... the NFL star showed big love to the guy at his football camp over the weekend -- less than three weeks after Darez was seen on video orchestrating an elevator attack.
Diggs invited Darez -- a former XFL player -- to help coach up kids at his "Diggs Day" event at the Univ. of Maryland on Saturday ... and you can see, Stefon seemed thrilled to have him there, despite the criminal investigation surrounding him.