string original = "{0} is a parent of {1} who is the brother of {2} who is..";
string[] args = new string[] { "Alice", "Bob", "Charlie", "Doug" };
string formattedString = String.Format(original, args);
Try the above code it will provide you your expected output.
I just changed List to string[].
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…