Former "19 Kids and Counting" star Josh Duggar's younger sister, Jessa Duggar Seewald, made her feelings about his infidelity known on Tuesday when she shared a link on Twitter to her father-in-law Michael Seewald's scornful blog post in which he said Josh lived a "lifestyle of evil."

"Go to https://seewalds.com," the pregnant 22-year-old tweeted to her followers, linking to Michael's blog post, "Grief, Shame, and Taking the Lord's Name in Vain," from Monday, Aug. 31. "And read the post on the Ashley Madison scandal."

Michael supported Josh in May when the eldest Duggar son's molestation of five underage girls when he was a teenager became public. He, like many people, had thought Josh achieved redemption over the years.

He blasted Josh for hypocrisy in using the Ashley Madison website secretly to cheat on his wife while being an activist for family values and Christianity.

"It doesn't surprise me that thirty nine million people are members of the Ashley Madison adultery website, nor do I think it surprises you," Michael wrote. "What is troubling is that many who take the name of Christ are among its members... It distresses me to say that Josh Duggar's greatest sin is a byproduct of the sum total of his secretly sinful lifestyle. That is, that by his hypocrisy, he blasphemed the name of God. He claimed to be a Christian, but by his deeds he has suggested otherwise. With the name of God on his lips he lived a covert and extensive lifestyle of evil."

Josh confessed to infidelity on Aug. 20 via a statement on the Duggar family website. The father of four labeled himself "the biggest hypocrite ever" and wrote that he has "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."

The troubled former family values activist checked himself into a long-term treatment center following the confession. It marks his second rehab stint.

In 2003, following the molestation of his four sisters and a babysitter, Josh was sent by parents, Jim Bob Duggar and Michelle Duggar, to counseling and faith training at a facility operated by the religious group Institute in Basic Life Principles (IBLP).

In addition to publicly agreeing with her father-in-law about Josh, Jessa also tweeted a link to a sermon called the "Passions That Prevent Adultery" on Monday, in which Pastor John Piper says, "The gospel convinces us of something irresistibly true, and then transforms our desires for something new. That conviction and passion keeps us out of bed with someone who's not our spouse and rejects a thousand other temptations."