'No uncertainty exists about Jim and Bob's attitude to Stan – they despised him.'
- or –
'No uncertainty exists about Jim's and Bob's attitude to Stan – they despised him.'
I have seen questions related to two people sharing a wedding or a house but what if two people each have an attitude and it's the same?
Best Answer
Either
or
are fine.
The first one is valid because it is a single attitude (against Sam) held by more than one person.
The second one does not carry such an implication.