NEW YORK, Aug 30 (Reuters) - Lehman Brothers has hired Jeb Bush, brother of the President of the United States, as an advisor to its private equity business, a source familiar with the situation said. Lehman hired another relative of U.S. President George W. Bush last year--George Walker, a second cousin, who heads up the bank's asset management business. Jeb Bush is the former governor of Florida. Lehman Brothers declined to comment. (Reporting by Dan Wilchins)