Shari Franke speculates about her mom Ruby Franke’s love life in her bombshell new memoir.

The 21-year-old claims in “The House of My Mother: A Daughter’s Quest for Freedom” (out Tuesday) that the former “8 Passengers” mommy vlogger, 42, was “sneaking around” with business partner Jodi Hildebrandt.

The pair pleaded guilty to child abuse charges in December 2023 and are both serving time for their horrific treatment of Ruby’s six children: Shari, Chad, 19, Abby, 17, Julie, 15, Russell, 13, and Eve, 11.

Shari alleges in her book that Hildebrandt, 55, moved into her room and demanded that she sleep on the living room couch.

She claims the room — and the entire upstairs — were “off-limits” to Ruby’s then-husband, Kevin Franke, without explicit permission.

Ruby allegedly moved into the room after Hildebrandt began “experiencing incredibly detailed visions,” and it became the duo’s “sanctuary,” where they often “hunkered down.”

Shari describes going back into her old bedroom during one of Ruby and Hildebrandt’s rare absences — which she claims were “shopping trips” to Mexico for pills — and being “confused” by what she saw.

“The room was bathed in the soft glow of candles,” she writes. “The air was heavy with the scent of lavender and vanilla wafting form the massage oils on the dresser.

“I quickly grabbed what I needed and got the hell out of there, feeling like I had just walked into someone else’s honeymoon suite,” Shari continues. “The only thing missing was rose petals on the bed.”

Ruby and Kevin’s eldest child goes on to claim that she saw her mother looking “mischievous” while leaving the bedroom around 5 a.m. the following morning.

“Her hair [was] messy, cheeks flushed and her robe hastily tied,” Shari alleges, recalling the “strange smile on her” mom’s face.

“What the hell was going on?” she asks in her memoir. “Why was Ruby sneaking around in the middle of the night like a teenager trying not to get caught by her parents? Were they really doing candlelit massages in my bedroom?”

She calls the duo’s connection “fascinating and horrific,” pointing out that they “condemned queerness very publicly in their ConneXions videos, while embodying it privately. In [her] room. On [her] bed, most likely.”

Shari insists she “would have supported” Ruby and Hildebrandt if they had been open about having an affair.

“It would have been preferable to living like … this,” she writes. “In this house of lies that I couldn’t bear to step foot in anymore.”

Shari first spoke out on social media in August 2023 after one of her “emaciated” siblings sought help from neighbors, leading to Ruby and Hildebrandt’s arrests.

“Finally,” Shari wrote via Instagram at the time. “Me and my family are so glad justice is being served. We’ve been trying to tell the police and CPS for years about this and [are] so glad they finally decided to step up.”

While Kevin, 46, was not charged with any crimes and has since divorced Ruby and attempted to gain custody of their kids, Shari claims in her book that he had “turned [his] back” when she needed him.