Could be Bae and perhaps a member of the lost boys. Pan does not age. Lost boys age, but I think at a slower rate
Oh dear…didn’t think of this…but if Rumple makes a deal with his son in this episode and Robert has said in interviews that Rumple does and it ends badly…then maybe Rumples deal turn BAe into Pan and he doesn’t age…that would suck…and it could explain why Rumple wants the curse broken…if it is broken then Bae can grow up.