The Bush Family
"cocktail putsch" in 1933 and impose a fascist military dictatorship. Nothing much came of it, no one was arrested, but Prescott saw his bank seized by the government in 1942 for its financial dealings with the Nazis.
George Bush Senior got to the top the old fashioned way, he inherited it from the sainted Ronald Reagan. In four short years he took the Reagan Revolution and a successful Iraq War and turned it into the worst result for a president seeking reelection since William Taft, getting just 37.5% of the vote.
George Bush Junior probably stole the presidency in 2000 when the Supreme Court ordered a stop to the vote count and gave him the office. When he left office he was thoroughly hated by both left and right. He has been reduced to painting childish art.
The Adams Family
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Son John Quincy Adams was the sixth president but he stole it from Andrew Jackson in the House of Representatives even though Jackson won both the popular vote and a plurality but not majority of the electoral votes. Like his father, Quincy was a one-term president.
The Roosevelt Family
Franklin was Teddy's fifth cousin, but family is family. He was so popular he won election four times. Effectively, FDR was his own dynasty. Between them, Roosevelts controlled the White House for almost 20 years.
The Harrison Family
Benjamin Harrison was William Henry's grandson. He beat incumbent Grover Cleveland (trivia: the city of Cleveland was named after a distant relative of Grover's) in 1888. Benjamin's signature accomplishment was greatly increasing the tariffs on imported goods, which was the 19th century equivalent of a massive tax hike. After one term, he was unpopular even within his own party and was defeated by the man he had beat earlier, Grover Cleveland. This dynasty manged to rule for just four years and one month.