static void Main(string[] args)
{
Person p1 = new Person("Ira", 1959);
Person p2 = new Person("Kolya", 1955);
Person p3 = new Person("Valera", 1956);
Person p4 = new Person("Janna", 1955);
Person p5 = new Person("Vika", 1984);
Person p6 = new Person("Yura", 1985);
Person p7 = new Person("Timur", 2016);
p7.AddParents(p5, p6);
p5.AddParents(p3, p4);
p6.AddParents(p1, p2);
p6.AddHeritors(p7);
p5.AddHeritors(p7);
p1.AddHeritors(p6);
p2.AddHeritors(p6);
p3.AddHeritors(p5);
p4.AddHeritors(p5);
p1.ShowHeritors();
p2.ShowHeritors();
p3.ShowHeritors();
p4.ShowHeritors();
p5.ShowHeritors();
p6.ShowHeritors();
p5.ShowParents();
p6.ShowParents();
p7.ShowParents();
}