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---
- hosts: localhost
  gather_facts: no
  vars:
    families:
      - surname: Smith
        children:
          - name: Mike
            age: 4
          - name: Kate
            age: 7
      - surname: Sanders
        children:
          - name: Pete
            age: 12
          - name: Sara
            age: 17

  tasks:
    - name: List children
      debug:
        msg: "Family={{ item.0.surname }} Child={{ item.1.name }} Age={{ item.1.age }}"
      with_subelements:
        - "{{ families }}"
        - children