"The Anthony family denies that there was any improper sexual behavior in their family nor was there ever a time when Casey told them of sexually inappropriate conduct by her brother or father," the family's attorney, Brad Conway, said in a statement.
Amidst the pile of flowery, hand-written notes, Anthony repeatedly complains about what she called her family's betrayal.
Anthony said she learned that after jail house visits, her brother and father were reporting on her to the police early on in the investigation.
"I find out that my brother was acting according to scripts, via law enforcement, when he came to visit me back in July and August and he was reporting back to them with whatever I told them," she wrote.
After Anthony found out her mother Cindy Anthony had applied for a trademark for Caylee's name, she wrote in one letter, "B-E-T-R-A-Y-A-L!!! I'm so sick to my stomach even thinking about this.
"I've done everything possible to hold my family together and I continue to get stomped on, thrown under the bus, and it doesn't surprise me anymore when it happens," she wrote.
Beyond the complaints and more personal revelations, Anthony discusses boys and letters she received from admirers repeatedly asking to marry her. She talks about what's on television, often punctuating with exclamation points and smiley- or frowny-faces.
"I need a vacation!," she wrote. "I am thinking of Costa Rica... want to come with? (Unfortunately we have to wait until we are released. Someday!)"
Anthony's defense team reportedly did not object to the letters' release, telling ABC News' Orlando Fla. affiliate WFTV they are not concerned with the content of the letters.