'Grandchildren are the best': Joe Simpson shares cute snaps from play date with Jessica's kids weeks after revealing cancer diagnosis

He recently revealed he is battling prostate cancer, and Joe Simpson has been focusing on his family in the wake of the diagnoses.

On Tuesday the 58-year-old spent some time doting on two of his beautiful grandchildren, Maxwell and Ace.

The father of Jessica and Ashley clearly loved spending time with the youngsters and took pictures of them playing, which he then shared to Instagram.

Focusing on his family: Joe Simpson spent time with his grandchildren Maxwell (pictured) and Ace on Tuesday 

Joe was at the playground with Jessica's two children after attending their Christmas concert.

The first photo he shared showed four-year-old Maxwell, who is the spitting image of her famous mother, dressed in black and playing in the sand. 

'Miss Maxwell after her stellar performance. Digging for hidden treasure...' Joe captioned the snap.

Joe was equally impressed with little Ace and posted a snapshot of the three-year-old with a sand-filled spade in each hand. 

Proud granddad: The 58-year-old had just been to see Jessica's children perform in their school Christmas show

Tough time: Earlier this year Joe, seen September 2015, revealed he is battling prostate cancer

'Went to see Ace in his first school Christmas Show. He did so good!' the proud granddad wrote.

On both of the Instagram photos he added the hashtag: '#grandchildrenarethebest'.

It's been a rough year for Joe, who confirmed in early November that he has prostate cancer. 

Just like mommy: Four-year-old is the spitting image of her gorgeous mom in this Instagram photo which Jessica recently shared 

It was also revealed he has undergone surgery and is already back at work.

'He's feeling great now and is optimistic,' a source close to Simpson told People. 'He's felt so much love and support from his family and friends.'

As well as Jessica, Joe is father to singer Ashlee Simpson, 32, who is married to Diana Ross' son Evan.

Supportive daughters: Both of his daughters, Jessica (pictured in February) and Ashley Simpson, 32, are said to be very supportive during this challenging time

Both of his daughters are said to have been very supportive during this challenging time.

In 2013 he divorced their mother Tina Ann Drew, 56. The two had been married since 1978. 

Simpson will next shoot the cover of Nation-Alist magazine in Japan. He has said photography makes him 'happy' and has been a longtime hobby of his. 

 Getting back to work: Joe (pictured in April 2015) has undergone surgery and is already back at work

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