do your guys's plants sneeze?
in the south of the united states, you might ask your pals "do y'all's pants bleed?" when speaking directly with an audience of more the one person, when speaking about possessions belonging to each of them. but in the northern half of the united states, where i come from, we would directly address crowds of one or more person(s), about their possession(s) belonging to each of them, as "your guys's" (pronounced like "your guises").
and that ... is ... a ... difference ... between people.
i vote your guys's is funnier.