Не пускает с модификатором полей private

public class Solution {
    public static void main(String[] args) {
        Human child1 = new Human("Аркадий", false, 15);
        Human child2 = new Human("Анжела", true, 16);
        Human child3 = new Human("Валера", false, 17);

        Human father = new Human("Олег", false, 37, child1, child2, child3);
        Human mother = new Human("Наталья", true, 35, child1, child2, child3);

        Human grandfather1 = new Human("Леонид", false, 70, father);
        Human grandfather2 = new Human("Ефим", false, 71, mother);

        Human grandmother1 = new Human("Надежда", true, 67, father);
        Human grandmother2 = new Human("Любовь", true, 68, mother);

        System.out.println(grandfather1.toString());
        System.out.println(grandfather2.toString());
        System.out.println(grandmother1.toString());
        System.out.println(grandfather2.toString());
        System.out.println(father.toString());
        System.out.println(mother.toString());
        System.out.println(child1.toString());
        System.out.println(child2.toString());
        System.out.println(child3.toString());

        //напишите тут ваш код
    }

    public static class Human {
        public String name;
        public boolean sex;
        public int age;
        public ArrayList<Human> children = new ArrayList<>();

        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... children){
            this.name = name;
            this.sex = sex;
            this.age = age;
            Collections.addAll(this.children, children);
        }
        //напишите тут ваш код

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

            int childCount = this.children.size();
            if (childCount > 0) {
                text += ", дети: " + this.children.get(0).name;

                for (int i = 1; i < childCount; i++) {
                    Human child = this.children.get(i);
                    text += ", " + child.name;
                }
            }
            return text;
        }
    }
}