Sync Three Switches in Home Assistant

sync_3_switches.yaml

blueprint:
  name: Sync three switch entities
  description: Mirror three switches by updating the status of the other linked switches to match the triggered switch state
  # Credit to https://github.com/bmaehr for original script logic
  domain: automation
  input:
    switch_object1:
      name: Switch 1
      selector:
        entity:
          domain: switch
    switch_object2:
      name: Switch 2
      selector:
        entity:
          domain: switch
    switch_object3:
      name: Switch 3
      selector:
        entity:
          domain: switch
variables:
  switch_object1: !input switch_object1
  switch_object2: !input switch_object2
  switch_object3: !input switch_object3
  switch_object12: 
    - !input switch_object1
    - !input switch_object2
  switch_object13:
    - !input switch_object1
    - !input switch_object3
  switch_object23:
    - !input switch_object2
    - !input switch_object3

trigger:
  - platform: state
    entity_id: 
      - !input switch_object1
      - !input switch_object2
      - !input switch_object3
    from: 'on'
    to: 'off'
  - platform: state
    entity_id: 
      - !input switch_object1
      - !input switch_object2
      - !input switch_object3
    from: 'off'
    to: 'on'
condition: "{{ trigger.to_state.context.parent_id == none }}"
action:
  - wait_template: "{{ (as_timestamp(now()) - as_timestamp(this.attributes.last_triggered | default(0)) | int > 2) }}"
    timeout: 2
  - service_template: >
      {% if trigger.to_state.state == 'on' %}
      switch.turn_on
      {% elif trigger.to_state.state == 'off' %}
      switch.turn_off
      {% endif %}
    data_template: 
      entity_id: >
        {% if trigger.entity_id == switch_object1 %}
          {{ switch_object23 }}
        {% elif trigger.entity_id == switch_object2 %}
          {{ switch_object13 }}
        {% elif trigger.entity_id == switch_object3 %}
          {{ switch_object12 }}
        {% endif %}