Understanding Dr. Johnson’s Family Picture
Family Composition
Dr. Johnson examines a picture of his family and identifies the following members:
– 1 grandfather
– 1 grandmother
– 2 fathers
– 2 mothers
– 6 children
– 4 grandchildren
– 2 sisters
– 2 brothers
– 3 sons
– 3 daughters
– 1 father-in-law
– 1 mother-in-law
– 1 daughter-in-law
Calculating the Minimum Number of People
What is the smallest possible number of individuals depicted in the picture?
Solution
The answer is 8 people. This includes 4 children (2 boys and 2 girls), their mother and father, along with their grandfather and grandmother, who are the father’s parents.