No U.S. President has had a brother that also held that office however George W. Bush's brother, Jeb Bush was considering running for President of the United States in 2012.
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no
Pres Jimmy Carter's brother was allergic to peanuts.
No.
Attorney General of the US.
I don't think so
The Vice President is the President of the Senate.
Robert F Kennedy served as the US Attorney General under his brother, President John F Kennedy, from 1961 until JFK's assassination in 1963. He then ran for the Democratic nomination for president in 1968 but was assassinated during his campaign. He never served as vice president of the US.
Are you assuming that the President is also dead?
The President of the US is the chief of the military.
President Obama
To be the president of the US Senate you must also be the vice-President of the United States.
Martin Van Buren holds that distinction.