A Brisbane, Australia, man realized he has autism after a psychologist diagnosed his oldest daughter with the disorder.

Jessica Offer wrote a blog post Thursday about the surprising revelation that dawned on her family three years ago.

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Her husband, Chris Offer, always thought of himself as "quirky."

"Imagine that all your life you're trying to be held…in this normal box and no matter how hard you try, you find it hard," Jessica told ABC News on Monday.

"And then someone goes, 'Well, that's because you're not normal.' It's freeing."

In a blog post she wrote, she said her daughter, Sno, had certain triggers.

"If I didn't give warning when I planned to change her usual breakfast food, she would not handle it. She never liked to be touched by other kids in (kindergarten)," Jessica Offer wrote. "I mentioned these quirks of hers to my husband. He dismissed them as normal."

After taking her in for formal assessments, doctors diagnosed Sno with autism. While learning more about it, Chris realized he too was on the spectrum.

"A few evenings later after Sno was diagnosed my husband and I sat down on the couch together and went through her diagnostic criteria. And it was here that we discovered that so many of her quirks were the same as his," Jessica Offer wrote.

A doctor later formally diagnosed him at age 30. The couple had been married for 7 years.

Jessica said learning about autism has only made her love Chris more.

"When I said yes to marrying my husband I said yes to him even and along with his quirks, which back then I had no idea were autistic. I loved him for the way he saw the world and how he worked within it," Jessica Offer wrote.

"Looking at the big picture I guess you could say that the things I love about my husband are probably his most autistic traits," she wrote.

According to Autism Speaks, tens of millions of people are living with autism worldwide.