'Duck Dynasty' star Uncle Si talks iced tea, marriage troubles and God

Uncle Si appears on "Duck Dynasty." (A&E)

Everyone's favorite uncle, Si, has a best-selling book out, “Si-cology 1,” and it's just like Si, charming, funny and just a bit cheeky. The Tupperware toting “Duck Dynasty” star spoke to FOX411 about the book and some surprising hardships that he's battled.

FOX411: What's with the cups?
Uncle Si: I'm always just carrying a Tupperware cup, ever since my mom went to a Tupperware party and got 'em. I've left them strewn all over the U.S. and Europe. I drink iced tea out of them.

FOX411: Will you have an iced-tea line?
Si: Well, that's in the works I think.

FOX411: Anything you guys have said no to?
Si: (Laughs) They're coming up with new ideas all the time. That's Willie's and Corey's department. I don't get involved in the business end of it.

FOX411: You write very honestly about your wife's difficulty in conceiving.
Si: She went to all the specialists and they all said, “You'll never have kids.” I said, “Don't worry about it.” She said, “Yeah but I know you love 'em so I'm not going to marry you.” I said, “Hey, don't worry about that. The doctors don't have the final word. I believe in a higher power,” and I've got what you call two miracle babies, my daughter and my son and they gave me four grandsons a piece.

FOX411: You were also very honest about your son's mental health issues.
Si: Yeah he had some serious problems. The doctors finally figured out the medicine he needed and then everything was fine. Sometimes it's necessary to medicate.

FOX411: It put a lot of stress on your marriage.
Si: Oh yeah but if you think you're going to go through this life without running into some problems then you need to think again. It's not going to happen.

FOX411: Do you think people get divorced too easily?
Si: Oh definitely. Look the Bible says that you marry for life okay. It's a lifetime decision. They look at it way too trivial.

FOX411: How important is your faith to you?
Si: That's what got me through 65 years of life. My belief in God and what He's done for us and what He will do for us. That's a lot of the problems now. Look a lot of people don't believe there's evil. If there's good in this world, then you're being intellectually dishonest, if you believe there's a good power you've also got to believe there's an evil power too. There are physical laws that are in place. We've got the physical world we see but there's a microscopic world that you have to have special stuff to see, just because you don't see it with your naked eye doesn't mean it doesn't exist.

FOX411: Why is “Duck Dynasty” so popular?
Si: Well, I think it's going back to the pioneer days. We're reminding Americans what this country was founded on, Bible-toting, God-fearing men and women.

FOX411: Why are you a fan favorite?
Si: That's a mystery! I can't figure it out. I look in the mirror every morning. I guess it's because I'm 65 years old, and I'm really about 10 years old. I've refused to grow up.