//Insert the modified child in list and save
public void SetModifiedChild(Child c, int i)
{
listChildren.RemoveAt(i);
listChildren.Insert(i, c);
list.SetList(listChildren);
list.SaveListOfChildren();
}
//insert new child in list and save this
public void SetListWithNewChild(Child c, ListOfChildren list)
{
List <Child> children = list.GetList();
children.Add(c);
list.SetList(children);
list.SaveListOfChildren();
}