Tony Abbott's sister Christine Forster is planning a summer wedding in Sydney with her long-term partner after Australia said 'yes' to marriage equality.
Ms Forster, who has been engaged to Virginia Edwards for four years, joined thousands of gay marriage supporters in Sydney's Prince Alfred Park on Wednesday to celebrate victory in the national postal survey.
She said it would mean "everything" to get married on Australian soil and Ms Edwards said their plans were well underway.
"We've booked a date, we've booked our venue, we've got our rings, we've got our beautiful designer and we're doing it on the 2nd of Feb," Ms Edwards told AAP.
More than 60 per cent of Australians voted in favour of changing the Marriage Act, a result equality campaigners have described as "resounding".
Ms Forster, a Sydney councillor, said legalising gay marriage would change Australia for their children's generation.
"Assuming this legislation gets passed quickly, as it should, kids of that age can know they have the same opportunities, the same future, the same rights, the same equality under the law that everybody else does," Ms Forster said.
Mr Abbott is a prominent opponent of same-sex marriage and framed the 'no' campaign as a vote on freedom of speech and religion.
In his NSW electorate of Warringah, 75 per cent of participants returned a 'yes' vote and Ms Forster said her brother had always said he'd respect the voice of the people.
"He's of the same view that I'm of, which is we now need to get on with it, get the legislation passed, put in place whatever protections need to be put in place, but get on with it and do it."