12. sugupõlveni
0━┳
David Rodney Ian Cowan 1951 &1977 Jacqueline Ann Capener 1951
┣━1━━
James Andrew Robert Cowan 1981
┣━2──
Georgina Denise Cowan 1984
┗━3━━
Christopher Francis Cowan 1987
Kokku: 3 järeltulijad (5 isikud koos [spouses])