Abraham Lincoln, 16th President of the USA is Hon. John Quincy Adams, 6th President of the United States' sister-in-law's husband's first cousin once removed's wife's sister's husband!

Hon. John Quincy Adams, 6th President of the United States → Louisa (Johnson) Adams, 6th First Lady of the United States (his wife) → show 7 relatives → Mary Todd Lincoln, First Lady (her sister) → Abraham Lincoln, 16th President of the USA (her husband)

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