Anna Duggar's brother Daniel Keller took to Facebook to air out his feelings towards his cheating brother-in-law Josh Duggar.

The former reality star admitted to cheating on his wife, Anna, in a message posted on the family's website. Duggar's sister Jessa Seewald took to Facebook yesterday to share a Bible verse, and Keller felt inclined to respond.

Seewald quoted from 1 John 1:8, "If we say that we have no sin, we deceive ourselves, and the truth is not in us. If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness."

Keller took issue with the passage, and according to Us Weekly, commented, "You have to confess and forsake your sin to have mercy. Not sin confess and repeat." He added, "Confessing and getting caught are two different things...You want to know what happens when you cover ur sin maybe you should go read ur bible instead of beating people over the head with it."

As other commenters responded to Keller, he replied, "I know that my sin sent Jesus to the cross just as did josh sin...But think for a min about the victims. Tell me how you would feel if someone cheated on your sister and brought so much disgrace to you and ur family. And when you done that. Go to hell you p----."

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Keller revealed that his parents are hoping Anna will stay with her husband because they are "more interested in how there (sic) daughter getting a divorce will make [them] look then (sic) they are in trying to truly get josh some help and getting Anna and the kids out of there till he has gotten that help." He directly called out his disgraced brother-in-law and called him a "pig."

Keller and Seewald's comments aren't the only responses to Duggar's admission. A Georgia mom penned an open letter on Facebook that has gone viral.

"I know everybody is laughing about this Josh Duggar story. Oh, a DUGGAR on Ashley Madison, it's so rich! I wish more people would talk about Anna," Jessica Kirkland wrote in her letter.

"What is Anna Duggar supposed to do? She can't divorce because the religious environment she was brought up would blame her and ostracize her for it," she added. "As a mother of daughters, [Anna's situation] makes me ill. Parents, WE MUST DO BETTER BY OUR DAUGHTERS."

Duggar apologized for his indiscretions last Thursday in a statement. He said, " I have been the biggest hypocrite ever. While espousing faith and family values, I have secretly over the last several years been viewing pornography on the internet and this became a secret addiction and I became unfaithful to my wife."

More reality star husbands on Ashley Madison!?