RP your brother-in-law as a dictator who has taken over the country and turned it to shit.

Can't. Tabletop RP game.

Do it anyway. Make it obviously him with like, one letter in the name changed but make him super political about elves or whatever's in the RP that can stand in for immigrants.

Imitate his voice, too.

As I normally get along with my bro-in-law, I will not likely do that novel idea. ;}

Aww. WAIT. Can you imitate a newscaster and talk about polls among woodland creatures at some point? That'd be hilarious regardless of politics. "The real question is, how do we sway the orc demographic?"

That, I can do.