Helen, Welcome to CiviCRM stack exchange. The Contact Editor extension provides UI to change contact types.


Do you have any extensions that might have disabled it? Otherwise I'm not sure how that would happen either but if you want to live on the edge you can use phpmyadmin or equivalent to do: UPDATE civicrm_relationship_type SET is_active=1 WHERE name_a_b = 'Household Member of'; You can also do it with api explorer (/civicrm/api3) and choose: Entity: ...

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