What's the maximum ratio for a Family rate Merlin Annual Pass? We require a minimum 3 people and a maximum of 2 adults aged 16 and over to purchase our family passes. Related articles Can I still take advantage fo the family rate, with my party being 6 or more? Who is entitled to the Family Rate? Do we have to be related to take advantage of the Family Rate? I'm a single parent, can I take advantage of the Family Rate? How old do you recommend a child is to have a Merlin Annual Pass?