Joe Simpson Spends Time With Grandchildren After Their School Christmas Show -- See the Sweet Pics

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Joe Simpson is getting some time in with the grandchildren this holiday season.

Jessica and Ashlee Simpson's 58-year-old father shared some family photos on Tuesday of his grandchildren, Maxwell, 4, and Ace, 3, after their school Christmas play. Jessica's children were playing in the dirt when their grandfather snapped photos of them.

WATCH: Jessica Simpson's Daughter Maxwell Is a Little 'Cowgirl' in New Horseback Riding Pic

"Went to see Ace in his first school Christmas Show. He did so good! #grandchildrenarethebest #jessicasimpson #love," Joe wrote. "Miss Maxwell after her stellar performance. Digging for hidden treasure... #grandchildrenarethebest #jessicasimpson #love"

This appreciation for family on Instagram comes a month after it was revealed that Joe was recovering from surgery after being diagnosed with prostate cancer.

WATCH: Joe Simpson Gets Support From Instagram Followers After Sharing Message About Cancer

"This is a blessing in disguise for Joe," a source told ET. "It has opened his eyes to eating healthier and exercising. This diagnosis has brought Joe and his family together and reminded him that what matters most is family."

Here's more on Joe's diagnosis: