My siblings and I do this all the time. But I do this through a 3-way call, I'll make the first couple nights of my reservation using my points, and then my brother will make the last couple nights of my reservation using his points. We have the 2 reservations linked so there will not be a room change or a check in/check out hassle.
You can rent points from 2 different members, but when the second member makes your reservation he would have to link it to the first reservation and then you would not have to change rooms.
I say can but I wouldn't recommend it. This is because when your second half of the reservation is finally made, the additional nights may not be available and then you might have to change rooms or even resorts depending upon availability.
So long story short, you should try for one member with enough points to make the entire reservation.