It's a big night at the Loud House, because Pop-Pop has a new girlfriend, and he's about to introduce her to the family. Upon arriving, Pop-Pop introduces his new girlfriend as Myrtle, and she takes an instant liking to the family, especially the children and their individual personalities. When nighttime comes, Pop-Pop decides to call it a day, much to the dismay of Myrtle and the kids.
The next day, the siblings arrive home, and are surprised to see Myrtle at their house, doing some cleaning up. Eventually, Myrtle becomes a nuisance to the siblings, as she begins smothering them with her kind nature. After a whole day of Myrtle making their day a nightmare, the siblings realize that they need to get Pop-Pop to break up with her in order to get her to stop. Lincoln remembers that Seymour had an eye for Myrtle, which gives them an idea on what to do.
At the retirement home, Luan and Lori manage to get Seymour and Myrtle into getting into positions that make it look like they're about to kiss. After taking the photos, they're uploaded onto a computer, and put into a single image to give off the impression that they're kissing. Upon completing the photo, Lynn sneaks it into Pop-Pop's room. The siblings attempt to escape before they get caught, but Myrtle sees them, and reminds them it's her birthday today.
Inside, the siblings ask Myrtle why there aren't many guests. Myrtle reveals that she was a single child, and because of that, she doesn't have much of a family. She also reveals that the reason why she hooked up with Pop-Pop was because she knew that he had a large family, and thought it would help her get the family she has long wanted, which is why she was so smothering towards them. Realizing her pity, the siblings realize that Myrtle is not as bad as she is. Suddenly, they remember the photo they slipped under Pop-Pop's door, so Lynn and Lincoln attempt to retrieve it before Pop-Pop finds it. Unfortunately, it's too late, as Pop-Pop has found the photo, and is starting to chase Seymour around the pool. After a brief scuffle, the siblings reveal that the photo is fake, and tell Pop-Pop what happened prior. After explaining, Pop-Pop forgives his grandchildren, and proceed to the dining area.
In the dining area, as the siblings and elders celebrate, the siblings decide to head back home, and Myrtle promises to see them tomorrow. Luckily, Pop-Pop, noticing the worry in the siblings, tells Myrtle that they'll meet up with the kids on Sunday, giving the siblings some personal time.
‣ Tandem Hoilday - Heinz Kelssing [Plays when the Louds were having dinner with Myrtle]