Same-sex marriage advocates are urging Australians to listen to the stories of people they know - not the 'no' campaign's "scaremongering" - before deciding their vote in the national survey.
"Don't listen to ads; listen to your friends, your family, your colleagues, your neighbours ... (and) think about that when you cross your mark on your ballot paper and vote yes," Liberal councillor - and Tony Abbott's sister - Christine Forster told reporters in Sydney on Sunday.
Standing alongside her long-term partner Virginia Edwards, Ms Forster accused opponents of playing on people's fears and uncertainty by seeking to expand the argument beyond one about marriage.
"The No campaign is trying to muddy the waters with issues that are not related. This is a simple question of whether or not you believe the law in Australia should be changed to allow same-sex couples to marry. That is as far as it goes.
"The reality is marriage law has changed in Australia 20 times since 1961 when the Marriage Act was legislated," she said.
"Any talk about anything further than that is simply designed to frighten people and that's not right."
Ms Forster encouraged voters to return their ballot papers back with a Yes vote, as she and her partner had already done.
"We're not going to get another chance at this. This is our one opportunity to do the right thing by everybody in this country to say that everybody has the same right to get married under Australian law."
Ms Edwards told reporters she wants to marry the woman she loves.
"Christine and I have been engaged for four years. I love this woman. I want to marry this woman on Australian soil in front of my friends and family."
The former prime minister's sister said it was "sad" to see the campaigning on both sides - on an issue that should never have been brought to a political campaign.
"It's completely unnecessary. We shouldn't be in this process but we are. It should have been legislated by parliament.
"The parliamentarians have abrogated their responsibility to do that."