The minimum number of tickets that could admit all of them is six (6).
This thing is impossible to explain in words, so I shall attempt it with a diagram:
Here are the six ladies:
( A ) ( B ) | | | | ( C ) ( D ) | | | | ( E ) ( F )
-- 'E' and 'F' are the daughters of 'C' and 'D' .
-- 'C' and 'D' are the daughters of 'A' and 'B' .
So look what we have now:
-- 'A' and 'B' are the mothers of 'C' and 'D' . There's 2 of the mothers.
-- 'C' and 'D' are the mothers of 'E' and 'F' . There's the OTHER 2 mothers.
-- 'A' and 'B' are the grandmothers of 'E' and 'F' . There's the 2 grandmothers.
-- 'E' and 'F' are the daughters of 'C' and 'D' . There's 2 of the daughters.
-- 'C' and 'D' are the daughters of 'A' and 'B' . There's the OTHER 2 daughters.
You want to know what ? ! The group is even bigger than THAT. There are also 2 GRAND-daughters in the family ... 'E' and 'F' .
So now you have a list of 12 people ! ... 4 mothers, 2 grandmothers, 4 daughters, and 2 grand-daughters ... and they all get in to the Christmas Market with only six tickets. Legally !
Such a deal !
Don't forget : Christmas this year is also the first day of Chanukah ! All for the same price !
