Meanwhile , in Olivia 's house , Sir Toby Belch ( her uncle ) has hoodwinked a foppish Sir Andrew Aguecheek into supporting him by convincing him that he could be a suitor to Olivia . There is a running feud between Malvolio and Belch ; with the help of Maria , Olivia 's maid , and Feste , a clown , Belch plots to make a buffoon of the steward .
It involves Olivia 's uncle , Sir Toby Belch ; another would-be suitor , a silly squire named Sir Andrew Aguecheek ; her servants Maria and Fabian ; and her father 's favorite fool , Feste .