Replying...
Intro. Yoongi and Jimin are cousins, best friends too, although they do not share blood, they only call each other cousins out of affection, their mothers are friends and they always got together at Jimin's mother's house so that Yoongi could play with Jimin, because even though Jimin was older than Yoongi, he liked to play with him, they always have fun doing their crazy things and complement each other very well, they play with Barbies or with Yoongi He sleeps at Jimin's whenever he can.

Yoongi/jimin

@Jungkook