Le Pen father is an antisemite, a racist and a generally despicable person who thought and was condamned for saying that the Holocaust is a mere "detail of history", not a denier.
That doesn't in any way make his party a offshoot of the Nazi party especially in its modern form. You might be a mere American and therefore throwing the word Nazi casually like a low grade insult. That doesn't justify implying that a third of France is voting for the Nazi party.
> The National Front party leader warned over the Easter weekend that French “civilisation” was under threat as she pledged to suspend all legal immigration and protect the French way of life, toning down her plan to take France out of the euro.
> “Give us France back, damn it!” the far-right candidate demanded at a rally in Paris on Monday night as her supporters chanted: “This is our home!”
> In comments clearly aimed at France’s Muslim population, she said: “In France, we drink wine whenever we want. In France we do not force women to wear the veil because they are impure . . . In France, we get to decide who deserves to become French.”
That doesn't in any way make his party a offshoot of the Nazi party especially in its modern form. You might be a mere American and therefore throwing the word Nazi casually like a low grade insult. That doesn't justify implying that a third of France is voting for the Nazi party.