As the resident FBW pioneer, here goes:
The F-16 stick inputs and manual trim inputs are summed. As the sticks are not mechanically connected, there is no feedback to the troop in the other seat ( family model). Besides, the sticks only move about an eigth of an inch to help with fine corrections flying formation. From the 447 thread, my understanding is the sticks move quite a bit, as they are not pure "force transducers" as in the Viper. But they, too, sum the two inputs.
No family models for the F-22 or F-35, so N/A.
Have to ask an F-18 troop how theirs work, as they have the basic control stick between the legs. They are also not 100% BFW as the USAF birds.
Same question for Concorde crews.