Bruce Forsyth discovers 'bigamist' in his family tree

19 July 2010 Last updated at 02:57 ET Help

Bruce Forsyth traces his family tree and discovers that his great-grandfather, Joseph Forsyth Johnson, appears to have been married to two women at the same time.

Who Do You Think You Are is on BBC One at 2100 BST on Monday 19 July and afterwards on BBC iPlayer.

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