Endings
Je -is
tu -is
Elle -it
Ils -issent
il -it
elles -issent
nous -issons
vous -issez
bobby and george -issent
ils -issent
elles -issent
bobby and george is a group and since it is a masculine it is also ils or issent ending .Therefore, the correct conjugation for the verb in this case is "-issent." This follows the plural rule for masculine nouns in French, (this doesn’t always have to be just masculine . if i have bobby and Sarah it would stil be ils because ils is being used as a mixed as well as an masculine
vous is more formal version of tu or plural version