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Slave Siblings Module is located in GUI_Modules/CharacterInfo or at least that is where I found it, but since I can't get several guild files to work I am not working on 6.6a, currently looking at 6.5b and it doesn't have ResourceScripts.game_res.upgrades.luxury_rooms anywhere.

i am pretty sure it should be there in 6.5b in luxury_room(): and update():, i am not sure about which lines tho, you can also search for:"Luxury Rooms: " since its next to .luxury_rooms stuff

Searching Luxury, results all return Luxury room taken in the line, will try editing line 78 as it looks the most promising?

$work_rules/luxury.text = "Luxury Rooms: " + str(luxury_rooms_taken) + "/" + str(ResourceScripts.game_res.upgrades.luxury_rooms + 1)

you have to make 4 edits, lines: 44, 45, 78, 79

i suggest you get vscode or n++ if you didn't already