The campaign, called #RingYourRellos, is similar to one launched in advance of Ireland’s marriage equality referendum in 2015 (initiatied by Trintity College Dublin students union, titled ‘Ring Your Granny for Marriage Equality‘).

In a video on the Australian Marriage Equality Facebook page, an Australian campaigner called Lisa phones her grandmother to solicit her support in the upcoming postal vote which will determine attitudes around the introduction of same-sex marriage.

Lisa starts the conversation by telling her grandmother that she’d like to marry her partner, Hayley, and that for this to happen, she’ll need her support.

#RingYourRellos – Here’s what happens when Lisa calls her Grandma…

In order to achieve a YES vote in the Marriage Equality postal survey, we need support from people of all ages and from all across Australia. That’s why it’s important that you talk to your friends and family and ask them to join you in voting yes.

Pledge your vote here: http://voteyes.org.au

When Lisa asks her grandmother how she’s likely to vote, her grandmother confesses that due to her religious beliefs, she would ordinarily say be against it. “But,” she adds, “knowing how much the two of you love each other – I can’t speak more highly of you and Hayley.

“I would agree to it. Yep,” she adds as a teary Lisa smiles.

Things have become heated on both sides as the postal vote – scheduled for next month – approaches, with Australia’s Education Minister Simon Birmingham accusing opponents of gay marriage of trying to conflate the simple question of whether same-sex couples should be allowed to marry with other, irrelevant, issues.

“It is trying to take the debate in a different direction which there is no validity to drag that debate to,” he said.

Voters will have the opportunity to return their postal ballot between September 12 and November 7.