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Male Robert Strayhorn Click to view Robert Strayhorn in the family tree

1   Robert's father was James Strayhorn and his mother was Mary Blackwood.  His paternal grandparents were James Strayhorn and Rachel Cabe. He had a brother and two sisters, named Calvin, Julia and Maggie.1 

1 5873.ftw
Further source/citation:
World Family Tree Vol. 1, Ed. 1 @ Tree #5873