Board Thread:Questions and Answers/@comment-67.87.108.136-20151229012010/@comment-32199573-20170604140335

Many people think that Laito is first, some think Ayato is first, it really doesn't matter since they are after all out beloved almost indenticle twins. But Laito is biologically the first from the triplets.

As you know Cordelia always calls Ayato the Successor, so of course if he is going to be the first, why not be the oldest from the triplets as well.

Now i am not a doctor but the logic in Diabolik Lovers is a bit off as well. It says that the triplets are born in three different days,20th, 21st,22nd of March. I don't think it is possible for triplets to be born on three different days, as i said i am not sure, but in my thoughts it isn't. So yeah Laito is the third son but because of reasons i guess they say Ayato is.

I hope this was helpful!