Joy Shiers, the mother of Prestatyn fire victim Lee-Anna Shiers, has told reporters: "We're overjoyed that we've got justice."
She added: "We want to say thank you to everyone who has supported us and helped us through this horrible time."
The family say they want to 'get on with normal life' following the verdict, adding: "Our angels would want us to carry on."
Neighbour Melanie Smith will be sentenced next month after being found guilty of five counts of murder.
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Campaigners hit out at a north Wales council after councillors backed plans to be the first in Wales with four-weekly bin collections.
A major crime review team raised concerns around the initial investigation, and the document was "a trigger" for the Surrey Police probe.
Five incidents, involving a man and a vehicle, have all taken place since January 26.