Karen,
Without butting into your family business, I would suggest strongly convincing the family members who would like to stay at the Poly to stay at VWL with you. UNLESS of course they are paying you for the points you will be using to stay at the Poly. A Sun-Thurs night in the value season of 2003 is 33 points for garden view

, 42 points for Lagoon view

, and 50 points for concierge

! The Fri-Sat points for value season are 60 points, 76 points and 90 points. These are points just for the value season.
Personally, that is way too many points for me to use on family members. If I had family memebers who really wanted to stay there, then I would have to charge them for the points. If you take the going rate of what points are renting for, $10/point...you are looking at $900 a night to stay in a concierge room on a Friday or Saturday, and that is in Value season! It is 99 points during regular season, so that would be equal to $990 in rented points. OUCH. I am thinking of staying at AKL, but not with my points, I will USE my points by renting them, and then taking the money I got from the points and paying cash for the AK room. I don't think AKL is renting for $310 a night. That is what I can get by renting the 31 points/night they want for AKL Sun- Thurs.
I do hope you can convince them. The points-cash value is too high.