Hence the term "secret"

Patron: Can you verify some information for me by looking in the old census reports?
Me: Sure!
Patron: O.K. can you look up Joe Schmo, who was born in 1883 in this certain county in Pennsylvania, and his wife was Susie Schmo and they had two kids name Rod and Todd?
Me: Yep! That's exactly was the census says here!
Patron: O.K. great. Now, does it say anything about all of the children he had with his secret, Italian wife?