using System;

public class Person

{

    public string FirstName;

    public string LastName;

    public Person Mother;

    public Person Father;

​

    public Person(string firstName, string lastName)

    {

        FirstName = firstName;

        LastName = lastName;

    }

​

    public void PrintFamilyTree()

    {

        Console.WriteLine(FirstName + " " + LastName);

        if (Mother != null)

        {

            Console.Write("Mama: ");

            Mother.PrintFamilyTree();

        }

        if (Father != null)

        {

            Console.Write("Tata: ");

            Father.PrintFamilyTree();

        }

    }

​

    public Person FindParent(string firstName, string lastName)

    {

        if (Mother != null && Mother.FirstName == firstName && Mother.LastName == lastName)

        {

            return Mother;

        }

        if (Father != null && Father.FirstName == firstName && Father.LastName == lastName)

        {

            return Father;

        }

        if (Mother != null)

        {

            return Mother.FindParent(firstName, lastName);

        }

        if (Father != null)

        {

            return Father.FindParent(firstName, lastName);

        }

        return null;

    }

}

​

class Program

{

    static void Main(string[] args)

    {

        Person you = new Person("Filip", "Piecyk");

        Person mom = new Person("Joanna", "Piecyk");

        Person dad = new Person("Krzysztof", "Piecyk");

        Person grandmaM = new Person("Jadwiga", "Lasok");

        Person grandpaM = new Person("Ryszard", "Lasok");

        Person grandmaF = new Person("Wanda", "Piecyk");

        Person grandpaF = new Person("Piotr", "Piecyk");

​

        you.Mother = mom;

        you.Father = dad;

        mom.Mother = grandmaM;

        mom.Father = grandpaM;

        dad.Mother = grandmaF;

        dad.Father = grandpaF;

​

        Console.WriteLine("Drzewo rodzinne:");

        you.PrintFamilyTree();

​

        Console.WriteLine("\nZnajdywanie Mamy:");

        Person foundParent = you.FindParent("Joanna", "Piecyk");

        Console.WriteLine(foundParent.FirstName + " " + foundParent.LastName);

​

        Console.ReadLine();

    }

}

​