The theory is it's likely one of the 18-year-old twins, Jedidiah or Jeremiah.
Not much is known about siblings Kendra and Lauren but it's reported their father is a preacher in Fayetteville, Arkansas.
Meanwhile, eldest sister Jana, 27, is still single!
Rumors about Jana Duggar being courted by a family friend are being put to rest by Jonathan Hartono, the man being linked to the "Counting On" star.
“Our families are close friends through church and this has allowed Kendra and me to get to know each other. ” Jim Bob and Michelle Duggar’s “courting” method includes only chaperoned dates, very minimal physical contact and absolutely no sexual relations before marriage.Hartono is denying that a recent bowling trip with Jim Bob Duggar, the patriarch whose family was introduced to the world on TLC Network's "19 Kids and Counting," was a sign that he was dating Jana.In a telling Instagram post, Hartono cleared up the speculation originating in Radar Online reports."Definitely did not have a 1 on 1 date with Mr.Josh Duggar’s sickening sex scandal hasn’t stopped the rest of the family members from having their own blossoming romances!Radar has learned that Joseph Duggar, 22, is officially “courting” a teenager named Kendra Caldwell."When is the courtship announcement coming for one or more of the Duggar boys? “Sooooo…" the Duggar family sleuth added, "Austin was helping with the flower trip, and so were those two Caldwell girls…again…" There is no putting one over on Duggar Nation.