There are four children in the family, namely A, B, C and D. One day, there are fewer candies on the table. The mother asked who stole the candies. Each of the four children said: A said: Among us Someone ate candy; B said: None of the four of us ate candy; C said: At least one of B and D did not steal candy; D said: I did not steal candy.
It's A and C who tell the truth if two of the four children are telling the truth and two are telling lies.