Yes, Barr has stated publicly about his family friendship with the Mueller’s spanning decades.

The question is does Barr want to swing at an end of a rope for high treason with his buddy and the other co conspirators because of their failed coup d'état to overthrow the President of the United States without a crime to investigate, while holding court by public opinion with leaked information to the news outlets.

Barr was sworn in as AG of the U.S. about a week ago and has had a week to add the Mueller investigation information to the House and Senate oversight investigations where congressional committee investigations have found no evidence of Trump/ Russian collusion.

With no additional information by Mueller’s probe about collusion, it would be hard to believe Barr would allow the Mueller investigation to continue much longer, since Barr could be ensnared by complicity while supervising the scope of this embarrassing and expensive scam.