private static void Add_Child()
{
Console.WriteLine("Enter ID:");
string id = Console.ReadLine();
Console.WriteLine("Enter first name:");
string firstName = Console.ReadLine();
Console.WriteLine("Enter last name:");
string LasttName = Console.ReadLine();
Console.WriteLine("Enter Mother ID:");
string motherID = Console.ReadLine();
Console.WriteLine("Enter birth date: (xx/yy/zzzz)");
DateTime bitrh_date = Convert.ToDateTime(Console.ReadLine());
Console.WriteLine("had special needs? (y/n)");
bool specialNeeds = yes_or_no(Convert.ToChar(Console.ReadLine()));
Console.WriteLine("explan:");
string infoSpecialNeeds = Console.ReadLine();
BE.Child child = new Child(id, firstName, LasttName, motherID, bitrh_date, specialNeeds, infoSpecialNeeds);
bl.addChild(child);
}