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[40k] What were the different primarchs relationships with each other, the emperor, and Malcodor or other humans?

Everyone more or less knows how guys like Horus felt about other people, but what about some of the lesser know primarchs? Did Mortarion or The Night Lord have any friends? Were the Salamanders pals with everyone or did they have grudges and beefs like the Space Wolves/Dark Angles? I heard somewhere that The Kahn and Magnus liked each other and that for some reason Angron and Lorgar hung around each other. Any thing in the fluff for stuff like this? Not even limited to stuff between primarchs, like how Alpharius or Angron felt about the Emperor. Maybe even lesser characters, like how since Rogal Dorne hung around Earth so much, did he develop any kind of relationship with guys like Malcador? Just wondering how the primarchs felt about each other and other characters.
gpt
>Did Mortarion or The Night Lord have any friends?

Mortarion and Konrad Curze were friends with eachother, and Mortarion was friends with Horus too. Mortarion hated everyone except Horus and Curze because no one had an upbringing as bad as him, he figured. Kinda weird Mortarion had a liking for Curze because he was a weak psyker.

>Were the Salamanders pals with everyone or did they have grudges and beefs like the Space Wolves/Dark Angles?

Salamanders have a grudge against all of the Traitor Legions, which isn't unexpected, but they were hit hard by the Dropsite Massacre. They went after Fulgrim and Perturabo's forces, as well as Alpha Legion outposts.

>I heard somewhere that The Kahn and Magnus liked each other and that for some reason Angron and Lorgar hung around each other.

Jaghatai had a friendship with Magnus, as well as Sanguinius, although he was afraid Magnus was delving too deep into warp magic. His friendship with Magnus is boosted by him and Magnus forming the Librarius together.

Angron and Lorgar were... kind of friends. He saved Lorgar from Guilliman, from a Warhound Titan stomping on him by taking *two* shots from the main weapon of it and throwing the foot of the Titan off of Lorgar. Lorgar paid him back by helping him ascend to Daemon Princehood, but even Lorgar, his bestest buddy in the whole wide galaxy (saying a lot, because Angron was a DICK) felt doubtful about it after Angron ascended.