First question: would we still be able to use those points towards booking at Aulani? Second question: how many points would we typically need for a family of 4 to stay during the summer?
I don't see where your points question was answered. It depends on what type of accommodation you would want and for how long. I will use the summer schedule of June 27-Aug 14 for 2016 on the points chart. A studio would be 24-31 points per night and a 1 bedroom would be 46-62 points per night. The range depends on standard, island, poolside, or ocean view.