Our family vacation ended up falling in line with my mom's vacation, and she has decided to go with us in September. However, her time off may change so she can't totally commit and be put on our ressie right now. I'm planning on calling Monday with the rest of the general public, to get FD. My question is....can we add my mom to our FD ressie sometime before we go? The original ressie will be me, my DH, and DD4 in one room at POP. I just want to make sure that we can add her in a few months time without losing our resort or FD. If it's not possible, then she'll have to pay OOP. 
