Each couple have their own way of disciplining children. For "Duck Dynasty" stars Willie and Korie Robertson, they believe that both kindness and strength are needed to raise God-fearing children.

The two—who are proud parents to Rebecca Lo, John Luke, Sadie, Bella, and Willie—said each child is different, each one requiring his or her own method of discipline.

"Some of our kids are one way, some of them were hard-headed, some of them were not. Some of them were super sensitive, so you have to take all of that into effect," Willie told ET Online. "I could look at Sadie one way, and she would start cryin'—like that!—it wasn't a spanking or anything like that, she was so sensitive. And John Luke was very hard-headed, and his brother, Will, was very hard-headed."

What Willie and Korie hate the most are lying and being disrespectful, so whenever their kids do those things, they have to resort to the strength tactic. "There was a handful of spankings," Willie admitted. "I mean, we certainly use that as an option. Not very much—we try to talk. Sometimes you gotta do a little swat, you know."

Willie even recalled how he disciplined John Luke when he was much younger. "I said, 'Do not touch' whatever I told him not to touch," Willie recalled. "So he was fake touching, and I popped them fingers. He looked at me and he was thinking, 'I didn't touch it!' I was like, 'You don't even act like you're gonna touch it! We're not playin' games.'"

Korie said it's inevitable for parents to sometimes feel unsure on whether to discipline their kids because they are afraid of hurting their children's self-esteem and confidence. But "kids need to see a strong role model," she said. "They need to see somebody who's confident and knows what's up."