Answer :
The given requirement is to define an instance method called `inc_num_kids` for the class `Personlnfo`. This method should increment the member data `num.kids` by 1.
Here is an example implementation of the `inc_num_kids` method:
```java
public class Personlnfo {
private int numKids;
// Constructor and other methods
public void inc_num_kids() {
numKids++;
}
// Other methods and fields
}
```
In the sample output provided, the initial value of `numKids` is 20. After calling the `inc_num_kids` method once, the value of `numKids` is incremented by 1, resulting in a new value of 21. The output states "Kids 20 New baby, kids now: 1" to indicate the original value of `numKids` (20) and the updated value after incrementing (21).
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