I think it's fair to say the lost one PCs know each other to some degree. And if they don't I'm willing to just flat state they all know Fancy and Fancy knows all them, just for ease of guaranteed gang cohesion and contact.

So consider Fancy a bottom line and figure out who knows who from there if you guys don't want the easy route of 'team PC knows the other PCs on team PC'. I personally vote for people being able to recognize each other as Lost Ones but little more than that, with the exception of 'everyone knows Fancy'.