A court in Siberia sentenced mother and son Valentina Baranovskaya and Roman Baranovsky to two years and six years respectively.
A court in the Ivanovo Region convicted Yevgeniy Spirin, 34, on charges related to extremism. Jehovah's Witnesses have been banned in Russia since 2017.
The religion has been outlawed in Russia since 2017 since when there have been a number of arrests of followers.
"The conviction of Sergey Klimov comes as no surprise in the present climate of raids, detentions, and arrests of Jehovah's Witnesses in Russia," a spokesperson at the church's world headquarters said.
The center plans on producing more audio-visual advice content that will focus on living a principled life and parenting.
"We feel deeply for Isaac, Negede, and Paulos, who have suffered harsh conditions for more than half their lives," a church spokesperson told Newsweek.
The men were convicted of being part of "an extremist organization," but church leaders insist they were jailed "for their peaceful Christian worship."
Critics claim Jehovah's Witnesses leaders have turned a blind eye to "massive and horrendous abuse" for years.
"It's not just a lawsuit, it's saving children. It's a public safety issue," says Irwin Zalkin, whose firm is representing two plaintiffs in suits naming the Governing Body of Jehovah's Witnesses as defendants.
Jehovah's Witnesses in Russia face a tough choice: be persecuted at home or become refugees abroad.
The EU's top court found that the Jehovah's Witnesses' door-to-door preaching is a form of data collection and requires consent.
Russia considers a wide range of political and religious dissent as "extremist" views.
Russia's crackdown on Jehovah's Witnesses comes as part of a government-backed drive against "foreign" religions.
Several Witnesses have died in prison over the past year, while others have been behind bars since 1994.
International human rights experts argue that Russia's persecution of the Jehovah's Witnesses is in violation of international human rights agreements.
The Kremlin has closed Jehovah's Witnesses prayer halls and banned the group's translation of the Bible as part of a campaign against minority religions.
The raids were conducted by around 150 police officers, who nicknamed their operation "Judgement Day," sources told Newsweek.
The religious group's administrative center in St. Petersburg, Russia, was seized by the government on Thursday.
There have been at least seven raids in the past four months.
The potential investigation follows news of letters and internal documents that show a pattern of sexual abuse by one Jehovah's Witness member, and the lengths the church went to cover up the scandal.
Jehovah's Witnesses have now exhausted the legal options regarding their ban within Russia.
A crackdown on Jehovah's Witnesses in Kazakhstan has followed similar actions against the Christian group in neighboring Russia.