Thank you everyone for your comments. They were all helpful in helping to decide what to do. I think that I wanted to be convinced that the best thing to do was to keep all of the points. Though I would love to keep them all in my family, I think that the reality is that I will probably keep the 200 points that my dad is going to gift me, gift my siblings some money to cover the other 30 points that I want to keep and let dad sell the rest. It would be a lot of fun to keep them all but that would be a significant outlay of cash right now plus the extra $$ each year for MFs. As I think about how we travel to Disney, I think that 230 points is enough. Although I do love to vacation at Disney, I also love to vacation other places too so I think that I will use that cash to do other traveling.
As for the rest of my family, my sister's kids are already in college or beyond and have shown little interest up to now in traveling to Disney so I doubt that will change. Her family really hasn't gotten as much use from the points as I have so I am not surprised that she wants to sell. My brother's kids are a little younger and have used them a little more. I wasn't sure what he would want to do but I'm not really surprised that he's ready to sell too. If they want to use them in the future, then I plan to rent them for what they cost me for the year, if I'm not using them myself. That way we both win.
These points were bought direct from Disney, so as long as my dad gifts them to me, I can keep all the perks.
I have one more question that I would appreciate opinions on. For all the years that we have had the points, I've been in charge of taking care of them. My parents have always paid the MFs by automatic payments, but I'm the one who has always monitored use and banked them when we had some left. When we have all gone on family trips together, I have been the one to make all the arrangements, usually spending a decent amount of time on the phone with member services to get everything taken care of. I'm also the one who is now supposed to take care of arranging the sale of the points. Would it be reasonable for me to charge a "commission" to my siblings for the time that I have spent on all this? I had thought that perhaps the extra amount that the BLT points are worth could be my commission (20% of our points are BLT, the rest are SSR). Is that reasonable or is that too much? Or should I just forget about that? My siblings probably have no idea that the BLT points are worth more but I want to be fair, and avoid any potential conflict in the future.
Thanks again for your input! I knew that this would be a good place to ask this!