2. On the left is 1, 4, 7; Middle 2, 5, 8; On the right are 3, 6 and 9.
3. The numbers 1, 2, 3, 4, 5, 6, 7, 8, 9 represent brothers and sisters.
The number 4 is on the left, which is the position of the fourth child. If the landscape configuration on the left is better, the situation of the fourth child is better. Otherwise, it is poor. And so on.