public class Solution {
    public static void main(String[] args) {
        Human grandFatherK = new Human("Кирил", true, 68);
        Human grandMotherK = new Human("Карина", false,60);

        Human grandFatherS = new Human("Санек", true, 65);
        Human grandMotherS = new Human("Света", true, 60);

        Human father = new Human("Витя", true, 32,grandFatherK, grandMotherK);
        Human mother = new Human("Оксана", false, 28, grandFatherS, grandMotherS);

        Human baby1 = new Human("Богдан", true, 13,father,mother);
        Human baby2 = new Human("Вика", false, 8,father,mother);
        Human baby3 = new Human("Катя", false, 5,father,mother);
    }

    public static class Human {
        //напишите тут ваш код
        String name  ;
        boolean sex;
        int age;
        Human father = new Human(name, sex, age);
        Human mother = new Human(name, sex, age);

        public  Human(String name, boolean sex, int age){
            this.name = name;
            this.sex = sex;
            this.age = age;

        }
        public Human(String name, boolean sex, int age, Human father, Human mother){
            this.name = name;
            this.sex = sex;
            this.age = age;
            this.father = father;
            this.mother = mother;

        }

        public String toString() {
            String text = "";
            text += "Имя: " + this.name;
            text += ", пол: " + (this.sex ? "мужской" : "женский");
            text += ", возраст: " + this.age;

            if (this.father != null)
                text += ", отец: " + this.father.name;

            if (this.mother != null)
                text += ", мать: " + this.mother.name;

            return text;
        }
    }
}