Friends and supporters of a Tamil family, who are facing deportation, have marched through the rain to Peter Dutton's Brisbane office.

Singing The Seekers hit I am, you are, we are Australian, the protesters first rallied at a crowd-funded billboard, which demanded the family be returned to their central Queensland home in the town of Biloela.

Supporters Marie Austin (second left), Saivashiri Balachandran (centre) and Margot Plant (right) are seen with a group of about 100 people who marched to Peter Dutton's office on Saturday. Credit:AAP

They then trudged a kilometre to the Home Affairs Minister's electoral office in Strathpine where family friend Marie Austin addressed the crowd of around 100.

"The reality is one person holds the power to save this family," she said on Saturday.