Hmm I already figured they were brothers however I'm starting to think they were switched or Walter struggling with a personality disorder I've been trying to figure out him every time I play I mean it each route he acts different and Gill's route was the one that stood out the most
I'm operating under the assumption that it's amnesia as a result of a traumatic childhood event tbh. Some of the flash backs in... I think it was Lars' route seem to imply that something happened to Walter and Herbert when they were younger that Walter blames himself for, though it's probably gonna be a while before we get concrete details about what exactly went down