I understand the position of Islam on having multiple wives – how they must be treated with utmost justice, and that normal people (if not most people) can not maintain two wives rightfully.

However, I just want some more knowledge and information on maintaining two wives. Like, the details on having two or more wives. What relationship is the between them? Can they live in the same house? Can they share the same bed? Are our children mahram to each other or to the sons of one wife to the other wives? Can you please send me some resources on this as I cant find anything

They can share the same house only if they agree to it and they can share the same bed if they agree as long as they do not see each other private parts.