I will be treating my son, mom, and aunt to a cruise for my mom's 70th birthday next year. I am paying for everything and am planning on surprising my mom this Christmas about the cruise (in Dec 24). My son and I will be in 1 room and my mom and aunt will be in the room next door. I want to prepurchase excursions, drink packages, and such. Since I'm booking them together, will they link in the royal app? I don't want to not be able to make reservations or buy stuff for her room.