Cousin Tree

I'm just curious:

(Rebecca) (Lisa) (Pollyanna) (John) (Quinn)
                              A - 18
C-18
                              E - 17
B - 16
D - 14
                 D-12
                 H-10
G - 7
                 L-6
S - 6
                               S-5              K - 5     D - 5
                 J - 4      
                               B - 3