Что не так? 22-ая строка

package com.javarush.task.task06.task0621; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; /* Родственные связи кошек */ public class Solution { public static void main(String[] args) throws IOException { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); String dedName = reader.readLine(); Cat catKeddy = new Cat(dedName); String babkaName = reader.readLine(); Cat catBabka = new Cat(babkaName); String fatherName = reader.readLine(); Cat catFather = new Cat(fatherName, catKeddy); String motherName = reader.readLine(); Cat catMother = new Cat(motherName, catBabka); String sonName = reader.readLine(); Cat catSon = new Cat(sonName, catMother, catFather); String daughterName = reader.readLine(); Cat catDaughter = new Cat(daughterName, catMother, catFather); System.out.println(catKeddy); System.out.println(catBabka); System.out.println(catFather); System.out.println(catMother); System.out.println(catSon); System.out.println(catDaughter); } public static class Cat { private String name; private Cat parentM; private Cat parentF; Cat (String name){ this.name = name;} Cat (String name, String parentM){ this.name = name; this.parentM = parentM;} Cat(String name, String parentF, Cat parentM) { this.name = name; this.parentM = parentM; this.parentF = parentF; } @Override public String toString() { if (parentM == null && parentF == null) return "The cat's name is " + name + ", no mother" + ", no father"; else if (parentM == null) return "The cat's name is " + name + ", no mother" + "father is " + parentF.name; else if (parentF == null) return "The cat's name is " + name + ", no father" + "mother is " + parentM.name; else return "The cat's name is " + name + ", mother is " + parentM.name + ", father is " + parentF.name; } } }