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How do i see the relation status between other factions?
Not my relations, every one elses…
Is this even a thing.

I don't think you can see those dynamically in-game, but you can see them (not in a very user-friendly way though) towards the start of save files. You can either unpack a save or make a new save in unpacked format and then check the savefile.

You can look at rogueys website:
https://roguey.co.uk/xrebirth/factions/faction-10/

I opened the argon government as an example, but you can click trough the other factions at the bottom end.
Sadly there is no list for all factions on the site.

Factions for Teladi Outpost:
https://roguey.co.uk/xrebirth/teladi-outpost/factions/

Factions for Home of Light:
https://roguey.co.uk/xrebirth/home-of-light/factions/

Great, thank you both.

I hadn't considered the faction relations was fully/mostly static.