Fulton County Sheriff's OfficeYoung Thug's brother, Unfoonk, is a return inmate at Fulton County jail -- law enforcement sources tell TMZ Hip Hop he's been arrested and booked for firearm possession by a convicted felon.
Unfoonk joined Gunna last December in entering a plea in the high-profile YSL RICO trial ... but his latest run-in with the law could lead to a violation of his probation terms.
Cops in Atlanta say Unfoonk (real name Quantavious Grier) was pulled over in his neighborhood around 4 PM Thursday ... and during the stop, officers claimed to have smelled burnt marijuana inside the black Mercedes sedan.
Waiting for your permission to load the Instagram Media.
ncG1vNJzZmivp6x7tbnZZ5qopV9nfXN%2FjmlsaGhlZMawwc2gZK2gpZx6o77OrZ%2Beql2Wv7Ox0q1koK2eYr2wv9Keqqyhn6N6ur%2FLZqmim59ivbO7wZqroqeeYsOqu8uaq6KnnmQ%3D