Silas "Uncle Si" Robertson promoted his newest book, "Uncle Si the Christmas Elf: Work Hard, Nap Hard," by taking a shot at "Star Wars" character Darth Vader in a recent tweet.

The book comes with an elf in Uncle Si's image, and the doll hijacked a Darth Vader display to communicate the Christmas story's message.

"Sorry #DarthVader We have 1 true Father!" Uncle Si tweeted. "Our book/doll set celebrates Him sending His Son 4 us elfentertainment.selz.com."

The "Duck Dynasty" star released the children's book and doll set last month in digital and physical retail stores. Uncle Si the Christmas Elf helps Santa Claus save a little boy's Christmas, and shows him the true meaning of the holiday. The set is recommended for children ages 4-8 years old, and has a retail price of $29.99.

Uncle Si's first book was an autobiography entitled "Si-cology 1: Tales and Wisdom from Duck Dynasty's Favorite Uncle." The release was No. 1 on the New York Times Nonfiction Bestseller list in 2013.

The same week that "Si-cology 1" had the top spot, two other "Duck Dynasty" books were also bestsellers. Si's brother, Phil, released his autobiography, "Happy, Happy, Happy: My Life and Legacy as the Duck Commander" to rave reviews, and it snagged the No. 3 spot on the New York Times list.

Phil's son and daughter-in-law, Willie and Korie Robertson, released "The Duck Commander Family: How Faith, Family, and Ducks Built a Dynasty," and secured the No. 9 position on the New York Times Bestseller list. The book describes what Willie's childhood was like, shares family recipes from Phil, Miss Kay, and Willie himself, and reveals Korie's secrets for balancing business, family, and the reality show.

The "Duck Dynasty" grandchildren are also following in their parents and grandparents' footsteps. Willie's daughter Sadie recently released "Live Original: How the Duck Commander Teen Keeps It Real and Stays True to Her Values." The 17-year-old's book details the principles that she lives by, and shares tips with other young people on how to follow their dreams while honouring God and their families.

The new season of the hit show will air November 19 at 9pm ET on A&E.