No biological sisters. He has one brother, Mike McCartney.
His father re-married after his mother died and his new wife had a daughter, Ruth, who is Paul's step-sister.
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As of July 2014, Paul Allen, the co-founder of Microsoft, has never been married and does not have any children. His net worth is estimated to be $15.7 billion.
The Founders of Microsoft.
Woody Allen has 5 children
He had three children: Portia, Allen, and Fred. Jr.
Not yet
Hermione, Bebe, Dolly and Violet