Kaeloo invites her cousin Kevin to Smileyland, but Kevin's brothers Kurt and Karl decide to tag along.
"Let's Play Family Reunion" contains the following tropes:
- Big Brother Bully: Kurt and Karl are this to Kevin.
- Call-Back: The episode has a flashback to "Let's Play Investigative Reporters", where the main four (except Kaeloo) met Kevin for the first time.
- Hypocritical Heartwarming: When Kaeloo's cousins try to hurt Quack Quack, Mr. Cat stops them and tells them he's the only one who gets to hurt Quack Quack.
- Screw This, I'm Outta Here: Mr. Cat leaves before Kaeloo can make the main four play with her cousins because their behavior remind him of the Cat family.
- Shell-Shocked Veteran: Mr. Cat finds himself unable to cope with being around Kaeloo's family because of past trauma involving similar situations in his own Dysfunctional Family.
