Our thoughts are with Jessica Simpson and Ashlee Simpson's father, Joe Simpson.

Following In Touch's revelation that he is battling prostate cancer, Joe took to Instagram to share this powerful message.

https://www.instagram.com/p/BM5iqYNFIo1/

The comments section is flooded with prayers and well wishes for the star.

Joe's rep confirmed to In Touch that he is sick and recently underwent surgery.

MORE: Ashlee Simpson's Kids Are All Grown Up — See the Photo

"The grim news devastated the entire Simpson family at first. Jessica and Ashlee especially took it hard," says a source. "They cried for days about his dire future, and the very real possibility of him dying. But, after initial shock wore off, they rallied behind him."