Investigators were there at the request of Children and Family Services to investigate a complaint that Castro left a child on a school bus while he was working as a school bus driver, Flask said.

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"I don't want to speculate what was going through his mind, but he is a natural child of the family and the two children who were victims in this were both adopted, " the sheriff added.

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In 2011 six members of the same family, a mother and her five children, were killed in north London, when a fridge freezer caught fire.

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Ms Wigzell said the actions of the pair were in "extremely bad taste" for a family event, with some people ushering children away in disgust.

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Until about a month ago, the family of six, with four children ages two to eight, were staying in an even smaller travel trailer while they waited for repairs on the four-bedroom house they rented.

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The bodies of the Mr Fuller and his three children were found in the overgrown quarry on 16 July after a member of the public spotted the family's 4x4 parked in nearby woodland.

BBC: Fuller quarry deaths: Children 'unlawfully' killed