At first, Kate and Allie seem to really love Trina and they are fans of her. This however, is only because she's Corey's sister. However, their relationship with Trina is pretty on and off. For in some episodes, they will prove that they are huge fans of her, and in some episodes they prove that they utterly despise her and the things that she does. This probably happened before they learned that Trina was Corey's sister.
Episodes featuredEditThe Bandidate where Kate and Allie were shown to love her. Group Hug. In this episode however, Trina reacted as Kate and Allie as though she's never even know that they've existed before and Kate and Allie reacted to her as though this was the first time they have ever met her face to face, contradicting with the events if this episode. It is also interesting to note this in this episode, Kate and Allie didn't refer to Trina with her real name at all and instead addressed her as "Corey's sister" every time they mentioned her.
Kate and Allie ran up to Jammy, screaming in joy when Trina demanded for everybody to love her jam.
Kate and Allie opened up a Valentines day card and the sound of Trina screaming in rage came out. This sound caused Kate and Allie to hate each other and sink into a depression.
Kate and Allie squealed when they saw Trina and Allie said "You're Trina Riffin!" Trina took pride in the fact that they knew who she was until she heard that they only liked her because she was Corey's sister. Trina was angry because of this and so she tried convinced them to hate Grojband by telling them that once Grojband rises in popularity and gains more fans, they will soon forget them. Then, she threatens them to tell her that she looks crazy cute, but instead, they just shake in fear. Corey later orders them to go and kidnap Trina for them so Kate and Allie sneak into Trina's room and use slumber berry candles to make her fall asleep. They then drag her to their garage replica and lock her up in chains.