What are the odds Joss has siblings?

All this talk about Jax makes me wonder if a brother or sister is going to show up anytime soon. The new Aussie doc at GH? The guy who was pushing for Joss to take over daddy's company? Jacinda? It would be very soapy if Jacinda turned out to be his half-sister's half-sister, and now wants to reclaim her birthright. Too bad Jacinda seems on the way out.