Программа выводит все задание согласно условия, но валидатор не пропускает

package com.javarush.task.task08.task0824; /* Собираем семейство */ import java.util.ArrayList; public class Solution { public static void main(String[] args) { //напишите тут ваш код ArrayList<Human> parents = new ArrayList<>(); ArrayList<Human> grandParents = new ArrayList<>(); ArrayList<Human> children = new ArrayList<>(); ArrayList<Human> family = new ArrayList<>(); children.add(new Human("Petua", true, 12)); children.add(new Human("Petua2", true, 12)); children.add(new Human("Ania", false, 12)); Human father = new Human("Ivan", true, 45, children); Human mother = new Human("Ivi", false, 42, children); Human grandPa = new Human("Victror", true, 76, parents); Human grandPa1 = new Human("Victror1", true, 77, parents); Human grandMa = new Human("Vika", false, 73, parents); Human grandMa1 = new Human("Vika1", false, 77, parents); grandParents.add(grandPa); grandParents.add(grandPa1); grandParents.add(grandMa); grandParents.add(grandMa1); parents.add(father); parents.add(mother); family.addAll(grandParents); family.addAll(parents); family.addAll(children); for (Human h : family){ System.out.println(h); } } public static class Human { //напишите тут ваш код String name; Boolean sex; int age; 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, ArrayList<Human> children) { this.name = name; this.sex = sex; this.age = age; this.children = children; } public String toString() { String text = ""; text += "Имя: " + this.name; text += ", пол: " + (this.sex ? "мужской" : "женский"); 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; } } }