private void keyMother()
        {
            ChildGroupMother = MyFunctions.ChildByMother();
            Mother mom;

            foreach (var item in ChildGroupMother) //show the mothers
            {
                mom = MyFunctions.FindMotherById(item.Key);
                ComboBoxItem combo = new ComboBoxItem();
                combo.Content = "ID: " + mom.Id + ", First Name: " + mom.FirstName + ", Last Name: " + mom.LastName;
                keyByMother.Items.Add(combo);
            }
        }