Actually I need the 2 bedroom for the entire trip. Our family of 4 plus MIL for the first 2 nights, then add SIL BIL and DNephew for the rest of the trip. I guess I don't understand the point of LINKING different reservations?

I'm totally confused.
If I have to have everyone who will ever be in the room during the entire trip on the reservation the entire time anyway, then it might as well be one reservation. KWIM? What exactly is the point of a linked reservation then? Is the linking thing really just for instances like where you pay cash for one night and points for the rest and stuff like that? Or is this only an issue with DDP?
I'm sure others on here have posted about having larger units and having the parties change during the trip(i.e. We'll be in a GV for 2 weeks and the first week DS and family will join us, then they leave and DD will arrive with her family,etc.) What am I missing?
Just when you think you understand all this
DVC stuff, you find out you're still clueless!

Don't you hate it when you've always thought you knew what something meant and now you find out you didn't have the right definition?