Grayson, 5, was diagnosed last week with T-cell lymphoma after his parents noticed swelling in his face, which they thought at the time was caused by an allergic reaction, the fundraiser says.
Larry Horowitz, Grayson's father, was flooded with gratitude.
"I'm overwhelmed by the concern through texts, voicemails, and from the outpouring of love and support from people in my life and from people I don't even know," he posted on the page.
"Even though you don't hear from me, your thoughts are recognized."
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