You might think that Jill and Jessa Duggar would be as close as two sisters can be.
After all, they're only a year apart in age, they're both newly married, Jill just got pregnant, and Jessa is sure to make her own announcement any day.
And yet, a close inspection of Jill and Jessa's Twitter pages reveals that there might be some bad blood between the two newlyweds. The reason?
While Jessa follows Jill and her new husband Derick Dillard on the site, Jill does not follow Jessa or her new husband of five weeks, Ben Seewald.
That may seem like a pretty minor offense, but it's worth noting that Jill follows just about everyone else who has any ties to her family whatsoever.
Some have pointed out that in the book Growing Up Duggar: It's All About Relationships, Jessa's siblings briefly acknowledge her role as the most difficult of the sisters.
In one somewhat humorous passage, Jana Duggar opens up about being repeatedly kicked by Jessa and responding by giving her a jewelry box as a gift.
(SIDE NOTE: The incident pretty much sums up Jana's role in the Duggar family, an often maligned, put-upon de facto third parent to her siblings.)
Are they jealous of each other now that their fame has risen? Could it be that Jessa was such a relentless bully as a kid that Jill is still unable to get over it?
Maybe. Either that or Jill just totally spaced on following her sister on Twitter.
They're all so close anyway, do they even need to follow one another on social media to keep tabs on their goings on? We may never know for sure.
One thing is for certain - if the rumors about Jana and Tim Tebow are true, Jill and Jessa are both gonna hate her, even though both are happily married.
Dude is the Holy Grail of fundamentalist, V-card-carrying beaus. Just saying.
As always, you can follow the link online to watch 19 Kids and Counting online and see if you can detect any negativity between Jill and Jessa.
Also, scroll through our rundown of the biggest Duggar scandals below ...