How many U.S. presidents were an only child?
Only four of this country's presidents can be considered only children.
All four had half siblings, however. Roosevelt had a younger half brother. Ford had four half brothers and two half sisters. Clinton has one younger half brother. And Obama has a half sister.
Interestingly, 11 U.S. presidents were the oldest child in their family, and six presidents were the youngest child in their family.
—The Fact Monster