An emotional Howie Mandel recently revealed his 9-year-old grandson, Axel, has been battling leukemia for the past four years, RadarOnline.com can reveal.

Axel, the son of the 69-year-old comedian's daughter, Jackelyn Shultz, was diagnosed with the blood cancer after a trip to Hawaii , and began undergoing chemotherapy within 24 hours. Article continues below advertisement

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The brave boy also had a bone marrow transplant thanks to a donation from his older sister, Abbey, 11.

He's currently in remission, Mandel reports. Article continues below advertisement

But Axel is still struggling with the aftermath of the treatment.

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