should_learn_chinese_trigger

should_learn_chinese_trigger = {
	save_temporary_scope_as = child_learned_chinese
	#Make sure they don't already know Chinese
	NOT = {
		knows_language = language_chinese
	}
	num_of_known_languages < language_soft_cap
	exists = house
	age >= 10
	is_faith_dominant_gender = yes
	probably_unintelligent_trigger = no
	house.house_head ?= {
		OR = {
			government_is_japanese_trigger = yes
			#This will account for korea and friends
			government_allows = merit
			culture = { culture_use_chinese_character_trigger = yes } # it's free content so don't block everything in gov type
		}
		OR = {
			#Cultural acceptance will be our guiding light for teaching young, noblemen (dominate gender) adults Chinese. These values will be set in game_start.txt
			culture = {
				OR = {
					cultural_acceptance = {
						target = culture:han
						value >= 65
					}
					any_parent_culture_or_above = { this = culture:han }
					has_cultural_tradition = tradition_sinophilic
				}
			}
			top_liege ?= {
				highest_held_title_tier >= tier_kingdom
				has_dlc_feature = royal_court
				has_court_language_of_culture = culture:han
			}
		}
	}
}

As written in game/common/scripted_triggers/10_tgp_japan_triggers.txt.