To be honest I've not drawn any positive conclusion as to if Amelia & Philip were already related, but I would guess that their meeting wasn't entirely coincidence. I might do some research here.
I would gladly copy & paste what I have on Amelia on to this message board, unless you would prefer me to e-mail you. If so send me a message on stewart.reid62(AT)ntlworld.com
(I have of course substituted @ with AT to prevent being spammed)