are they? It's all the same company with the brand today just used for appealing to localized government funding (because we can just shutter that factory you have there!). In the small marketshare electric future these multiple brands will be useful to kill one by one without tarnishing the remaining brands too much.

Renault is not a part of Stellantis.

You might be confusing Renault with Peugeot, that is indeed Citroën with a lion (or is Citröen a Peugeot with two angles?). Anyways, Renault is actually half-merged with Nissan and Mitsubishi.