Wondering if 5 adults are allowed to stay at Port Orleans Riverside? Not so much 5 adults as 2 parents with 3 children over age 9.
If your youngest is closer to nine and the size of an average nine year old, you might work. Otherwise, your youngest/smallest might not fit on the Murphy bed. You'd probably be better of in a family suite, two value rooms, two POR rooms or even possibly a Deluxe room that sleeps five (not all of them do).