isolate_family_decision_effect

isolate_family_decision_effect = {
	show_as_tooltip = {
		every_close_family_member = {
			custom = every_close_family_member_at_court
			limit = {
				is_courtier_of = root
			}
			add_character_modifier = {
				modifier = isolating_modifier
				years = 5
			}
		}
		add_character_modifier = {
			modifier = isolating_modifier
			years = 5
		}
		if = {
			limit = { exists = involved_activity }
			if = {
				limit = { involved_activity.activity_host = root }
				invalidate_activity = involved_activity
			}
			else = {
				remove_from_activity = involved_activity
			}
		}
	}
	if = {
		limit = { NOT = { exists = current_travel_plan } }
		custom_tooltip = travelling_will_break_isolation_tt
	}
	hidden_effect = {
		every_close_family_member = {
			custom = every_close_family_member_at_court
			limit = {
				is_courtier_of = root
			}
			root = {
				add_to_variable_list = {
					name = isolating_relatives
					target = prev
				}
			}
			isolate_single_character_effect = yes
		}
		every_consort = {
			limit = {
				is_courtier_of = root
			}
			root = {
				add_to_variable_list = {
					name = isolating_relatives
					target = prev
				}
			}
			isolate_single_character_effect = yes
		}
		isolate_single_character_effect = yes
		set_variable = {
			name = isolating_cooldown_var
			years = 1
		}
		add_character_flag = { # Prevent the AI from constantly coming in and out of isolation
			flag = ai_unisolate_cooldown
			years = 1
		}
	}
	stress_and_fulfillment_impact = {
		brave = minor_stress_impact_gain
		gregarious = minor_stress_impact_gain
	}
}

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