The Department of Justice, led by Mr. Barr, who is far and away the most partisan of Attorney Generals in American history, has decided not to investigate either of the two Bidens. There was a long Congressional investigation driven by the Republicans, who were eager to find evidence, and they found NOTHING.
There were no "corrupt ties". Neither of the two Bidens did anything wrong. You have no evidence to even suggest criminal behavior on the part of either person.