Paralympian Jonnie Peacock looks back through the generations and ends up captivated by his four-times-great-grandmother.

Paralympian Jonnie Peacock looks back through the generations and ends up captivated by his four-times-great-grandmother.

Paralympian Jonnie Peacock looks back through the generations and ends up captivated by his four-times-great-grandmother.

Oscar-winning actress Olivia Colman travels to India to find out more about her great-great-great-grandmother.

Oscar-winning actress Olivia Colman travels to India to find out more about her great-great-great-grandmother.

Comedian Lee Mack finds out more about his great-grandfather, who was also a comedian, known as Billy Mac.

Comedian Lee Mack finds out more about his great-grandfather, who was also a comedian, known as Billy Mac.

Boy George expects to find sadness in his family tree, but delights in a new sense of his family being part of Irish history.

Boy George expects to find sadness in his family tree, but delights in a new sense of his family being part of Irish history.