I would use are.
https://owl.english.purdue.edu/owl/resource/599/01/
1. When the subject of a sentence is composed of two or more nouns or pronouns connected by and, use a plural verb.
I would say the above trumps this:
10. Collective nouns are words that imply more than one person but that are considered singular and take a singular verb, such as group, team, committee, class, and family.
I would use the plural because there are two nouns in the subject.
I would also say Bill and Ted are having an excellent adventure. Not Bill and Ted is having an Excellent Adventure.
It does seem to vary US/UK though (that �s a US source above) re: collective nouns.
I would also say fish is healthy (when talking of the food), the fish are healthy (when talking about the bowl of them), but seafood is healthy. I would not say fish and seafood is healthy.
In all honesty, I think either works. And I also suspect that it doesn �t really matter. I wiki �ed it and it mentions notional vs. formal agreement. Or look at Metonymic merging of grammatical number under Collective Nouns.
Not to base my idea on wikipedia, but to suggest that both are possible for collectives (which matches my instinct as Canadian).
Following my other example above, I guess Americans would see them as a single collective. Bill and Ted�s Excellent Adventure. I see Bill S Preston and Ted Theodore Logan as two separate people, and I would use the are for that reason. Even though they went through the adventure together.
