Apex Get Person Class Updated

GetPerson.cls

public class GetPerson {

  public String x_id {get;set;}
  public String name {get;set;}
  public Integer age {get;set;}
  public List<String> kids {get;set;}
  public Car car {get;set;}
  
  public class Car {
    public String model {get;set;}
    public String year {get;set;}
  }
}