Corey Simms and his family are preparing to celebrate Christmas and as the exciting holiday nears, the Teen Mom 2 dad's father, Jeff Simms, has shared a series of photos of his twin girls, Ali and Aleeah Simms.

In the first photo shared, Jeff's granddaughters were seen looking out a window while wearing a set of festive dresses.

"Two years ago: Twins watch Santa leave the annual Simms Christmas Gala after his appearance," he wrote in the caption of the photo below.

A photo posted by Jeff Simms (@poppawjeff) on Dec 20, 2016 at 6:16am PST

Days ago, Jeff shared a photo of Ali and Aleeah which appears to have been taken over the summer. In the caption, Jeff included a message about the children's 7th birthday.

"Happy birthday to my twin granddaughters! You taught me how to be a poppaw 7 years ago and my life will never be the same," Jeff wrote.

A photo posted by Jeff Simms (@poppawjeff) on Dec 16, 2016 at 6:28am PST

A couple of weeks prior, Jeff posted a photo of the twins in their carriers.

A photo posted by Jeff Simms (@poppawjeff) on Nov 24, 2016 at 5:46pm PST

 

Simms shares twins Ali and Aleeah with his first wife Leah Messer. He is now married to wife Miranda and the two share a little girl, Remington Monroe, 1.

To see more of Corey Simms and his family, tune into new episodes of Teen Mom 2 season 7B, which premieres on Monday, Jan. 2, at 9 p.m. on MTV and check out the season trailer below.