Each son has a sister.
Q: How many people are in the family?
A man has nine sons.
Plan Family Trips
Each son has a sister.
Q: How many people are in the family?
But this simplicity hides a clever trap that has caused millions to pause and recalculate.
1. The First Trap: Speed in Addition
Most people’s first reaction is: 9 sons + father = 10.
Then they add “sister,” making it 11. Some automatically add the mother, making it 12.
And this is where the debate begins.
