Entities → Groups Relation

File in server/game/Entities	Includes file in server/game/Groups
Creature / Creature.cpp	Group.h
GameObject / GameObject.cpp	Group.h
Pet / Pet.cpp	Group.h
Player / KillRewarder.cpp	Group.h
Player / Player.cpp	Group.h
Player / Player.cpp	GroupMgr.h
Player / Player.h	GroupReference.h
Totem / Totem.cpp	Group.h
Unit / Unit.cpp	Group.h