add_kinslayer_trait_or_nothing_effect

add_kinslayer_trait_or_nothing_effect = {
	save_scope_as = slayer
	if = {
		limit = {
			murdering_character_is_kinslaying_in_my_or_same_dynasty_lieges_rite_trigger = { CHARACTER = $VICTIM$ }
		}
		if = {
			limit = {
				is_available_quick = { advanced_ruler = yes }
				NOT = { knows_doctrine = doctrine_kinslaying_accepted }
			}
			add_known_doctrine = doctrine_kinslaying_accepted
		}
		if = {
			limit = {
				is_close_family_of = $VICTIM$
			}
			if = {
				limit = { this = scope:slayer }
				set_trait_rank = {
					trait = kinslayer
					rank = 3
				}
				remove_piety_level_for_shunned_or_criminal_trait_effect = { TRAIT = trait:kinslayer_3 }
			}
			else = {
				add_trait_force_tooltip = kinslayer_3 #This is to make sure trait appears in notification messages for other characters
			}
			shunned_or_criminal_sf_impact_effect = { TRAIT = trait:kinslayer_3 }
		}
		else_if = {
			limit = {
				is_extended_family_of = $VICTIM$
			}
			if = {
				limit = { this = scope:slayer }
				set_trait_rank = {
					trait = kinslayer
					rank = 2
				}
				remove_piety_level_for_shunned_or_criminal_trait_effect = { TRAIT = trait:kinslayer_2 }
			}
			else = {
				add_trait_force_tooltip = kinslayer_2 #This is to make sure trait appears in notification messages for other characters
			}
			shunned_or_criminal_sf_impact_effect = { TRAIT = trait:kinslayer_2 }
		}
		else_if = {
			limit = {
				dynasty ?= $VICTIM$.dynasty
			}
			if = {
				limit = { this = scope:slayer }
				set_trait_rank = {
					trait = kinslayer
					rank = 1
				}
				remove_piety_level_for_shunned_or_criminal_trait_effect = { TRAIT = trait:kinslayer_1 }
			}
			else = {
				add_trait_force_tooltip = kinslayer_1 #This is to make sure trait appears in notification messages for other characters
			}
			shunned_or_criminal_sf_impact_effect = { TRAIT = trait:kinslayer_1 }
		}
	}
}

As written in game/common/scripted_effects/00_secret_effects.txt.