Just a small issue, but I think it appropriate that the default on this control be changed back to Y
In bV19 you have expanded these entries/families automatically.
I suggest that the method of presentation in bv18 was superior as it is sometimes confrontational to be presented immediately with the first partner who may be dead or divorced. It is much nicer to be able to choose the partnership to view that suits the reader.
It gets particularly ugly when somebody has had five wives.