The DiLaurentises will have a little reunion in the seventh episode of "Pretty Little Liars" season 7.

The trailer for the upcoming episode titled "Original G'A'ngsters" revealed that Alison's (Sasha Pieterse) older brother Jason (Drew Van Acker) is back in Rosewood to check on her. But Jason's return means trouble for their long-lost aunt Mary Drake (Andrea Parker) since he seems to be determined to kick her out of Alison's life.

In previous episodes, Alison appeared to be warming up to her aunt despite everything that she had been through when Mary worked with Elliot Rollins (Huw Collins) to make her pay for Charlotte's (Vanessa Ray) murder. According to the synopsis for the upcoming episode, Jason will warn his sister about being too close to Mary.

The Liars' lives will also be in danger in the upcoming episode. Based on the trailer, the Liars will be trapped inside a car with a ticking time bomb.

"Oh my god, we're going to blow up ... that's what countdowns mean," Hanna said in the trailer.

Could this have something to do with the Liars' sudden discovery of a cellar that Mary and Mrs. DiLaurentis kept hidden for a long time? A.D. could be planning to keep them away from finding out more clues about the new big bad's real identity.

The official synopsis for the upcoming episode reads:

"Jason returns to town to stop Ali from getting too close to Mary. The girls learn something new about Mary and Mrs. DiLaurentis that leads them to a storm cellar full of clues. Ezra (Ian Harding) gets a call about someone in his past that could change his course. Noel Kahn (Brant Daugherty) grows more and more suspicious and rises to the top of the list of suspects for Uber A."

"Pretty Little Liars" season 7, episode 7 airs Tuesday, Aug. 9, on Freeform.