Prime Minister Tony Abbott has vowed to "do the right thing" and attend his sister's same-sex wedding but insists he will never support the union.
Speaking with 3AW's Neil Mitchell, Mr Abbott said his sister Christine Forster's engagement to her partner Virginia Edwards will not stop his government from attempting to veto the ACT's newly passed same-sex marriage laws.
"I am a traditionalist on this," Mr Abbott told 3AW, before revealing that "if there's a ceremony of some kind, yes, I will be there with a present. I'll do the right thing".
But despite his well wishes, the Prime Minister says the nuptials will do little to change his view on the contentious matter.
"From time immemorial in every culture that's been known, marriage, of that kind of solemnised relationship, has been between a man and a woman."
The Commonwealth has now lodged a claim in the High Court challenging the validity of the ACT's same-sex laws.
It's a challenge that Mr Abbott claims is a legal and not a moral one.
Author: Natasha Lee, Approving editor: Nick Pearson