While talking to a castmember in the Christmas shop, he told me that for special events, such as the family of the day, or even when they let a family stay overnight in the castle, they would be picked random. He said that the person in charge of picking that day could look for the fourth couple where the woman is taller than the man, or the 12th person they saw that day wearing Mickey Ears, or a child with red hair and freckles. It changes each day and is very random.
We were chosen to be in the Jammin' Jungle Parade at AK by castmembers. My DH, son and I were just strolling along holding hands and laughing about something -- so we were very random. My son still talks about being in the parade!:sohappy: