Another FCC question

[kaerofan]

I realize FCC is non transferable, however I believe I read somewhere that it may be transferable if its from people that were originally booked in the same room.  For the cruise that was cancelled, my sister and I as well as our 2 kids were booked in one room (they were the 3rd and 4th passengers).  We received the FCC and my sister and nephew will not be cruising before it expires.  My question is, can we combine their FCC with ours since we were originally on the same booking that received it?