He was seen all the way back in DK64 so it’s not Kaptain K. Rool who is actually just K. rool. Nope it’s K.Lumsy Rool who in the Japanese version of DK 64 was said to be the brother of King K. Rool. [https://mario.wiki.gallery/images/thumb/7/7d/K.\_Lumsy\_-\_Donkey\_Kong\_64.png/300px-K.\_Lumsy\_-\_Donkey\_Kong\_64.png](https://mario.wiki.gallery/images/thumb/7/7d/K._Lumsy_-_Donkey_Kong_64.png/300px-K._Lumsy_-_Donkey_Kong_64.png)
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Edit: Also Chunky Kong is also a kid…yeah crazy to believe huh? But look at his clothes and behavior.