WASHINGTON - The Florida law firm that employs President Joe Biden's brother Frank ran a newspaper ad on Inauguration Day touting the brothers' relationship and shared values, a move that is causing an ethics headache for the administration less than two weeks after Biden took office. Biden has promised to lead a highly ethical administration, which he has pitched as a contrast to his predecessor, and has adopted unusually strict rules for those serving in his administration, although they do not necessarily apply to family members. The two-page "advertorial" ran on Jan. 20 in the South Florida-based Daily Business Review...