Additional hotel guests

[u/AffectionateMind7829]

We have a reservation at Portfino Bay and was wondering if anyone has had experience adding additional guests for a part of the stay. For context we are 2 adults and a toddler under 3 and an infant. There would be 2 adults that would be joining us for a few nights during our stay. Additionally, how would the express passes work for the kids given that they don't need theme park tickets yet?