Who were the Roman parents for Gwen and Bobby?

I don't think the book answered that pregunta :( ....

They do not mention who Bobbys parent is. In fact, they just mentioned his name, and that he was in Percys cabin. I am pretty sure they do not mention who Gwens parent is either.

I think, since Gwen is nice, she is a daughter of Venus.
I don't know about Bobby, he rarely shows up in the book.

Gwenis Apollo and I don't know bobby parent is :(