you don't have to say anything (except you should definitely affirmatively invoke your right)
Others often can say "i'm not getting involved" or something not misleading or deliberately intended to help you avoid prosecution[1]
But note: Outside of privileges, others often do not have that right to say nothing, it's just not forced in a lot of cases because it's pointless.
[1] they can also often be forced to get involved as a material witness, blah blah blah, in a lot of cases. You just wouldn't put them on the stand anyway because they're not going to be helpful.
Others often can say "i'm not getting involved" or something not misleading or deliberately intended to help you avoid prosecution[1]
But note: Outside of privileges, others often do not have that right to say nothing, it's just not forced in a lot of cases because it's pointless.
[1] they can also often be forced to get involved as a material witness, blah blah blah, in a lot of cases. You just wouldn't put them on the stand anyway because they're not going to be helpful.