//เขียนโปรแกรมโดย นางสาวมนปริญา ทองโคตร

using System;

public class dad

{

    public string aname;

    public string alastname = "Horiguji";

}

public class mom : dad

{

    public string bname;

}

public class yuki : dad

{

    public string yname;

}

public class Program

{

    public static void Main()

    {

        dad a1 = new dad();

        mom b1 = new mom ();

        yuki y1 = new yuki ();

        a1.aname = " Toshiyuki";

        b1.bname = " Wongdeuan ";

        y1.yname = " Monpriya ";

        Console.WriteLine("My name is {0} {1} ",y1.yname,a1.alastname);

        Console.WriteLine("My father’s  name is {0} {1} ",a1.aname,a1.alastname);

        Console.WriteLine("My mother's name is {0} {1} ",b1.bname,a1.alastname);

    }

}