up to the 12th generation
0━┳
Terence Edmund Thomas 1931 &1961 Alexandra Rosemary Eva Dawkins 1941
┣━1━━
Trevor Terence Thomas 1961
┣━2─┬
Vanessa June Thomas 1963 &1992 John Christian Sperling 1954
┃ └─1──
Lisa Alexandra Sperling 1988
┗━3──
Amanda Jane Thomas 1970
Total: 4 descendants (7 individuals with spouses)