Baker Todd Mooney, 54, and his daughter Kirra, 10, were found dead after fire tore through a large shed at their home on Fenwicks Road, Biggenden about 12.20pm on December 20.
Mooney had been due to marry his long-term partner at the property this week.
Police have today revealed they believe the fire, which took several hours to extinguish, was deliberately lit.
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The SES has helped search the property and a neighbouring paddock today as police investigate the deaths.
Anyone with information, CCTV or dashcam footage in the area at the time is urged to contact police.
