A Beenleigh family who suffered the heartbreaking loss of their two year-old son and brother in a house fire last month have found an unlikely benefactor.

Billionaire federal politician Clive Palmer has rented a luxury Gold Coast mansion for Belinda Warwick and Jared Campbell, whose son Roman died when their home was gutted by fire last month.

The couple and their five surviving children lost everything they owned when fire tore through their home, trapping the toddler in a back room.

Mr Campbell was collecting the couple's eldest child from school when the blaze erupted, quickly taking hold of the weatherboard house.