Beppe Fenech Adami, the son for the former Prime Minister, is to vote No when the Divorce Bill comes up in Parliament.
"I will vote No as I choose to be consistent rather than popular," Dr Fenech Adami told timesofmalta.com.
He said he was comforted by the fact that there appeared to be a majority for the Bill to be approved, in line with the outcome of the referendum.
"There is no need for unanimity for the Bill to be approved, the referendum result was not unanimous either," he said.
He said that had the majority in parliament been in danger, he would have had to consider his position and resign from Parliament, because he could not vote for something which he considered to be wrong.
He said he also drew comfort from the fact that the majority within his own district (the eighth) had voted against divorce.
Infrastructure Minister Austin Gatt has also publicly declared he will vote against the Bill. Other No votes are expected from Gozo Minister Giovanna Debono and former Parliamentary Secretary Edwin Vassallo.
Shortly after the referendum result was known, Dr Fenech Adami had stressed that divorce legislation could go through Parliament without opposing parliamentarians compromising their personal values.
“What Parliament needs to pass this law is a majority and I think there will be a majority in favour of the introduction of divorce without the vote of those who feel strongly about not voting in favour,” he had told The Times.
The Nationalist party took an official position against the introduction of divorce, even though the private member’s Bill had been presented by their own backbencher Jeffrey Pullicino Orlando.
However PN General Secretary Paul Borg Olivier has reiterated that Nationalist MPs have a free vote in parliament, as long as the Bill is approved, in line with the referendum result.
The Prime Minister's brother, Michael Gonzi, earlier today said he would vote yes.
In the Labour camp. MP Adrian Vassallo has said he would vote No while Marie-Louise Coleiro said she will abstain.