John Adams, son of President John Quincy Adams, marries his first cousin
On February 25, 1828, John Adams, son of President John Quincy Adams, marries his first cousin, inadvertently following the pattern of keeping marriages within the family.
John Adams' grandfather, President John Adams, had married his third cousin, Abigail Smith. Intermarriage skipped a generation with John Quincy Adams marrying a non-relative. But, at age 25, John Quincy's second son, John, married his mother's first cousin, 22-year-old Mary Catherine Hellen, in a private ceremony at the White House.
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