b. Niente affatto. Secondo me solo QUESTO a Gianni (gli) dovremmo dire: che stiamo bene e che ci divertiamo.
not at all according to me only this to Gianni to-him (we) should say that (we) are good and that (we) have a good time
Not at all. I think that we should tell Gianni only the following: that we are fine and we are having a good time