So things may be confusing to explain in the story so here is a run down of the relationships both romantic and brotherly.

Family Profiles

Jeon Jung Kook
Jeon Jung Hoseok / Jhope

Min Yoongi
Min Suga / Agust D

Kim Taehyung
Kim Namjoon

Kim Seokjin
Kim Yugyeom

Park Jimin
Park Jinyoung / Junior (Jr.)

Friendships:
& nicknames for each other

Basically the hyungs are all friends minus Yoongi and all the maknaes are friends.

Hyungs  (seem scary and unapproachable but actually teddy bears) -

Suga / Agust D
Hoseok / Jhope
Namjoon / Rap Monster
Seokjin / Jin
Jinyoung / Junior  (Jr.)

Maknaes (innocent smols that need protection) -

Jungkook / Kookie or Jungkookie
Yoongi / Yoongs
Yugyeom / Yummy or Gyeomy
Taehyung / Tae Tae or Tae
Jimin / Chim Chim or Chimbles

Ships/Romantic relationships:

Sugakookie - Suga & Jungkook
Yoonmin - Yoongi & Jimin
VHope - Hoseok & Taehyung
Namjin - Namjoon & Jin
Yugnior - Jinyoung & Yugyeom