Susanna Keller, the unmarried sister of “19 Kids and Counting” star Anna Duggar, is being avoided by Duggars as the conservative family is unhappy about the 22-year-old getting pregnant before marriage, Radar Online reported Thursday, citing sources. The Duggar family has always celebrated a child's birth, but it is disappointed that Keller failed to embrace the family's fundamentalist Christian beliefs, a source revealed.

Keller, who appeared on the show in 2008 when it was called "17 Kids and Counting," reportedly gave birth to a daughter last year and kept the news a secret. She decided not to marry the father of the child that further angered the Duggars, sources reportedly said. Radar Online reported that fans may not see Keller in any of the episodes of the TLC show when it returns in February 2015. 

The involvement of the Duggar family with Josh Duggar’s in-laws could reportedly affect the fan base of the show, reports said. Duggar patriarch, Jim Bob, has also reportedly decided not to mention Keller’s name on the show. 

“It would be bad for the Duggar brand,” explains the source. “She broke away from everything his family represents, so viewers shouldn’t expect any televised trips to visit this in-law,” a source said, according to Radar Online. "[Jim Bob] has his radar up for any hint of rebellion," the source added.

Earlier this month, Anna and Josh announced that they were expecting their fourth child. The couple has three children, Mackynzie, 5, Michael, 3, and Marcus, 1, with the youngest being born on June 2, 2013.

Meanwhile, there have been courting rumors between Jana Duggar, Jim Bob and Michelle Duggar’s eldest daughter, and Tim Tebrow, which were dismissed by the former NFL quarterback’s representative.

The “19 Kids and Counting” fans have been waiting for the next wedding in the family since Jessa Duggar, 22, married Ben Seewald in November.