Poe Josh's big brother?

In the series Secret Society Girl-- Diana Peterfreund, is Poe (James Orcutt) Keyser Soze (Josh Silver)'s big brother? Their both secretaries of their club and studying to be lawyers so i figured it might be a possibility. Plus that would be very ironic considering that Amy ends up dating Poe in the 3rd book and Lydia is dating Josh.