"She's, you know, had a little bit of help from some speechwriters," he told CNN's "The Situation Room." "But most of it's been her own thoughts. And she'll talk about my dad and his vision and what you — why he should be president and what he'll do once he's there."

According to excerpts of the speech released early, she also plans to push back on the idea that she and her husband have lived a life of constant comfort that is foreign to most Americans. 

"She really understands that, you know, you don't always see the troubles people are going through," Craig Romney noted.

Ann Romney, for instance, has battled breast cancer, multiple sclerosis and more than one miscarriage. She has spoken openly about all three, inviting criticism of her early-stage cancer diagnosis and questions about the severity of her MS.

Ben Romney, a physician, noted that MS can take different forms. "We're very glad that it hasn't affected my mom as much as it can affect other people," he said. He noted that horseback riding, acupuncture, reflexology, herbal medicine and nutrition have all helped Ann Romney cope. 

"She talks to us a lot on the trail. And she'll tell us, OK, it's time for me to take a break," he added.

All five Romney sons have campaigned along side their parents this year. 

Her grown sons were full of complements for Ann Romney, with Josh Romney crediting her "great motherly instinct" and admitting to being "pretty naughty at times" as kids.

Craig Romney said she is "always very compassionate and very sincere in her dealings with other people."

All five of the Romney boys denied they have political ambitions of their own, although they singled out Josh Romney as the most likely to get into politics.

"I think each of us are just really focused on getting my dad elected, and I haven't thought beyond that," Josh Romney replied.