"Uma Sick" is the second episode.
Uma gets sick.
Uma is in bed and starts coughing uncontrollably. She wakes up, thinks she's sick, and calls Grampu. When Grampu walks into her room, he takes her temperature and realizes she really is sick. Wanting to neglect his responsibilities as a grandpa, he dips out. Grampu goes into Oobi's room and tells him to stay away from Uma so he doesn't catch her cold. They decide to go to Walmart so they can have some fun while avoiding Uma's sickness.
Meanwhile, Uma is waiting for someone to take care of her. She calls out for Oobi and Grampu but nobody answers, so she walks around the house searching for company. She realizes she'll have to take care of herself again, so she dramatically pours a bowl of Special K cereal and calls it "Lucky Charms, the magical cure for any sickness." After shoving her face in the cereal and making suggestive noises, she takes it to the couch and watches TV.
Uma hears Oobi and Grampu returning from Walmart, so she walks to the front door and is happy to see them. They can't let her be near them while she's sick, so they trade places. They put her outside and take the house for themselves. Uma waits outside while they play a game of Pictionary. Grampu starts drawing on a paper, then unknowingly moves his pen onto the table and keeps drawing on it. Oobi just keeps asking, "Is it a horse? ...A horse?"
After a while, Oobi asks Grampu if they should check on Uma. Grampu says she's fine and is probably pretending to be sick for attention. Oobi keeps pestering him until he agrees to check up on her. Outside, Uma starts shooting Special K from her fingers and seems to be covered in milk. Grampu realizes his mistake as the Seinfeld ending theme plays.