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Male William Wallace Lincoln Click to view William Wallace Lincoln in the family tree

William Wallace was born on December 21st, 1850.1   William Wallace's father was Abraham Lincoln and his mother was Mary Ann Todd.  His paternal grandparents were Thomas Lincoln and Nancy Hanks. He had three brothers named Robert Todd, Edward Baker and Thomas.  He was the second youngest of the four children.1 

1 basel.FTW
Further source/citation:
World Family Tree Vol. 9, Ed. 1 @ Tree #2571