Settlement requirements

[HAEXVS]

Hello,
I would like to know where, in which file, i can modify the required number of inhabitants to improve towns and castles.
If anyone knows, please do tell.
Thank you.

[HAEXVS]

I finally found it.
It's descr_settlement_mechanics.xml file in data folder.
There on the bottom is this:

Spoiler Alert, click show to read: 

<population_levels> <!-- city -->
<level name="village" base="300" upgrade="1100" min="130" max="1500"/>
<level name="town" base="1200" upgrade="5500" min="150" max="5500"/>
<level name="large_town" base="5000" upgrade="12000" min="200" max="10500"/>
<level name="city" base="9000" upgrade="20000" min="250" max="16500"/>
<level name="large_city" base="16000" upgrade="30000" min="300" max="16500"/>
<level name="huge_city" base="4000" min="350" max="20000"/>;-----------------------------------UNUSED for recruitment
<!-- castle -->
<level name="moot_and_bailey" base="300" upgrade="900" min="125" max="1800"/> ;village
<level name="wooden_castle" base="1500" upgrade="4000" min="150" max="6500"/> ;town
<level name="castle" base="6000" upgrade="8000" min="200" max="9500"/> ;large_town
<level name="fortress" base="4000" upgrade="13000" min="250" max="10500"/> ;city
<level name="citadel" base="4000" min="400" max="12000"/> ;large_city---UNUSED for recruitment
</population_levels>

The number after "upgrade" is the required number for upgrading the settlement.

[Gigantus]

Correct, thanks for coming back with your solution. The 'household' definition was a bit misleading, it's actually 'population'

[sullivanclan1]

When a general has this ancillary trait Foreign Fruitcake. How do i get rid of it? I tried remove_ancillary this foreign_fruitcake, remove_ancillary this "foreign_fruitcake", and remove_ancillary this "Foreign_Fruitcake". What is the best way to get ride of this ancillary trait and Bureaucrat? I may have spelled that wrong.

[Gigantus]

'this' only works in a script after the character is selected. You need to use the name of the character.