Workhouse for Dervla Kirwan's great-grandfather

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Consultant psychiatrist Brendan Kelly has bleak news for actress Dervla Kirwan about her great-grandfather Henry Kahn. He was sentenced to 12 months hard labour after a miscarriage of justice sending his life on a downward spiral.

Who Do You Think You Are? is on BBC One at 2100 BST on Monday 2 August 2010 and afterwards on BBC iPlayer.

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