Tonight’s episode of “The Simpsons” was inspired by writer Rob LaZebnik’s son, who is gay. There have been indications over the years that Waylon Smithers, the loyal assistant to Homer’s boss Mr. Burns, is gay. The New York Post reports that the episode is inspired by the son of the man who wrote it.

When Waylon Smithers Jr. finally comes out Sunday night after 27 years in the closet on “The Simpsons,” he won’t be the only one celebrating.

Longtime show writer Rob LaZebnik tells The Post he penned the episode in support of his own 21-year-old son, Johnny, who is gay.

“I am a Midwestern guy, so I don’t tend to wear my emotions on my sleeve, but I thought, ‘What better way to tell my son I love him than to write a cartoon about it?’ ” says Rob.