How to change the culture? (Crusader Kings 3)

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If the character: You can only if you have captured a different district of the culture you need and in the decisions you can take this culture OR WHEN the child is born to give it to the character of the culture you need and tick "change the culture" and then with some probability the child will change the culture (also you can with religion) and you will already play for another ...
If the districts: Go to the board, the superintendent, the third task of "spreading culture" and after a certain time the culture will change. It mainly depends on the skills of the manager

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