Ancestry Chart:
|
1 
2 and 3 Mating Yes
2 Father 4 and 5 Mating Yes
3 Mother 6 and 7 Mating Yes
6 Grandfather 12 and 13 Mating Yes
7 Grandmother 14 and 15 Mating Yes
14 Great-grandfather 15 Great-grandmother
[=13 - Great-grandmother]
