First, we'll start out with the main family. For the first round, it'll be one family and evolve from there.
~The Horace William Davies Family~
DH: Horace William Davies (53)
DW: Jocelyn Stephanie Davies (49)
-DD: Victoria "Tori" Elizabeth [Davies] _______ (24)
--DH: ______ _______ _______ (27)
-DD: Margaret "Margie" Jane Davies (21)
--DBf: ______ _______ ______ (25)
-DS: Theodore "Theo" William Davies (19)
-DD: ______ _____ Davies (15)
-DS: _______ _______ Davies (12)
-DS: ______ ________ Davies (10)
-DD: _____ _______ Davies (9)
Tori's husband's first name is a traditional English name that isn't used very often these days. His middle name is either Greek, Italian, French, or Danish. His last name means "small."
Margie's boyfriend's first and middle names are from same of one of the Romance languages (Spanish, Italian, French, Portuguese, or Romanian). His last name corresponds.
The last four Davies' first and middle names must fit with the theme of their older siblings' first and middle names.