Until your government is a Salic Monarchy you will get the event "two sons" if they are born. This mechanic and its event will disappear once you upgrade your government, and to do that you need a higher administrative technology.

Oook, thank you. Actually I'm an Empire and I can't change my government, and my administrative tech is at 38. What administrative tech is necessary ? Thank

40; you should get the government reform national decision to switch to a Feudal Monarchy if I recall correctly.

Ok, thank you very much !

Hello,
I have the 40th tech admin. But, as Empire, I can't change my type of government ("régime politique" in French). I haven't nationals decisions... So, I don't know how to process. I still have the multi child event... Not a big problem (I can disinherit child or hope than Empire stay united), but I really wanted to know for others games. Thank.

I discovered if you have Dharma you can just go into governemt reforms and change to Autocracy or Feudal nobility for the cost of 10 corruption

На всякий напишу для людей которые не хотят ждать 32 админ техи. Как с помощью читов это можно убрать:
1) заходим в папку с модом(это будет архив который примерно называетсяe1ecfed0-a736-11eb-86c3-c7ca7f7358ea )
2) в архивен нажимаем "common" и после "event_modifiers"
3) открываем txt документ "et_event_modifiers"
4) находим в документе нужный нам ивент и удаляем его от туда(в нашем случае two\three sons)
ps: изменения не внесутся в файл поэтому скопируйте его, измените, удалите старый и добавьте новый.