Holocaust deniers seek to wipe out victims' existence.

MY sister married a wonderful guy. His father was a Hungarian Jew. During World War II, he and his eight brothers and sisters were imprisoned in Nazi concentration camps. Some were killed in gas chambers. Others were put on a boat that was deliberately sunk.

By the war's end, my brother-in-law's father was the only one left. For years, his wife would find bread stuffed under his pillow, a habit from Nazi starvation.

Every now and then some nut case says the Holocaust was faked. Usually, you dismiss him as pathetic.

Last week, however, a man named Hutton Gibson told a national radio host that the Holocaust never happened, that there were no concentration camps, only "work camps," and that Jews basically made the whole thing up.

Hutton Gibson is Mel Gibson's father.

So this nut case must be addressed.

He must be addressed because his son has made a movie called "The Passion of the Christ" depicting Jesus' last hours. There are fears the movie will stoke anti-Semitism. I have not seen the film yet so I can pass no judgment on it. But I have heard his father. And he needs no movie to spew hatred.

Jews "are after one world religion and one world government," Hutton Gibson declared. He said Federal Reserve Chairman Alan Greenspan, who is Jewish, should be hung. He said Holocaust museums were "a gimmick to collect money."

In fact, he called the entire Holocaust "fiction." He said Jews weren't killed, "they simply got up and left! They were all over the Bronx and Brooklyn and Sydney and Los Angeles. They have to ... go where's there's money."

That would be news to my brother-in-law's aunt, another Holocaust survivor who, thanks to Nazi experiments, was left unable to have children. She still bears a Nazi number on her arm.

I suppose Hutton Gibson would call that "a tattoo she got in the Bronx."

Now the elder Gibson is not new to this stuff. He writes books and magazine articles denying the Holocaust and scorching the Jewish faith.

And I am not saying Mel Gibson believes what his father does. But he needs to say so himself.

Instead, to date, Gibson has refused to fully refute his father. He acknowledges the Holocaust, but says, "Nothing can drive a wedge between me and my blood. He's my father. I love him."

That's fine. But denying hatred does not cancel love. By his own doing, Gibson has put himself on a stage where he has new obligations. He has made a deeply religious movie, a lightning rod for Christians and Jews, one he claims was inspired by his faith, including "going back to the things I was raised with."

One presumes his father did some of that raising.

The reason Nazism existed is because people lived in denial. If you visit the site of concentration camps today, you will be astounded by how close neighborhoods were to the gates. Yet no one did anything--even as innocent people were murdered a stone's throw away.

Gibson said he made his movie because he could no longer deny his faith. Imagine someone denying your existence.

Mitch Albom is the author of the bestseller "Tuesdays With Morrie."