Todays puzzle 24-11-2011

A family photo contained:

one grandfather, one grandmother,
two fathers, two mothers,
six children, four grandchildren,
two brothers, two sisters,
three sons, three daughters,
one father-in-law, one mother-in-law, one daughter-in-law.

29 people you may think, but no! What is the fewest number of people that could have been in the phot

Solution Of  Todays Puzzle 23-11-2011