Marion Le Pen, left, has urged voters to elect her aunt Marine in the name of Frenchness
Marion Le Pen claimed her aunt's closest rival, the liberal independent candidate Emmanuele Macron, would eradicate what's left of the country's "Frenchness" by continuing to pursue a policy of EU intergration and open borders.
The 27-year-old, the Front National MP for Vaucluse in south east France, spoke of the sacrifices made by millions of Frenchmen during the First and Second World War, and said a vote for her aunt was a vote to defend what those men died for.
"Fathers, uncles, brothers went to sacrifice themselves so that France would stay French," she said during a speech in Sens, Burgandy, the Observer reported.
"If a century later we fail to ensure that France remains French, it will mean that their sacrifices were in vain and we will have betrayed our ancestors.
"Let us be worthy of our heritage. Vote Marine Le Pen."
Le Pen said the Front National would hold a referendum on EU membership in a bid to restore the nation's sovereignty, much as Britain's Leave campaign said Brexit would do for the UK.
She pledged to commit to a policy of "economic patriotism" – fining French companies relocating to eastern European countries for cheap labour.
Her aunt would "not hesitate" in introducing a blanket travel ban – as US president Donald Trump has attempted – if there was evidence travellers posed a threat to the nation.
And immigrants with a right to live in France would be told to respect France's culture and history – including the right for women to wear what they like.
Marion Le Pen said liberal canidate Macron was a threat to French culture
Fathers, uncles, brothers went to sacrifice themselves so that France would stay French
Marion Le Pen
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By contrast, Marion Le Pen said Macron, who is currently tipped to win the election, treated France like a "start-up business" who saw the country as a "space" instead of a country.
She sad historic French architecture such as Sens' own gothic cathedral "doesn't exist" for the liberal candidate.
"The only thing that counts is productivity, the economy, benefits," she said.
Marion Le Pen echoed the words of her aunt, the Front National leader
Le Pen's words echo those of her aunt Marine's, who has spoken at length of keeping France "French" and appealing to a vague set of core values considered lost in the modern world of globalisation.
Macron, a centrist and former protege of Francois Hollande, is currently the favourite with bookmakers to beat Le Pen.
But after the shock victories for Brexit and Donald Trump, many commentators are hedging their bets.
The French election takes place over two rounds in April and May.