Is the entire sentence grammatically correct? I'm not sure about "的". Should I remove it or just leave it?
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的 in 我爷爷的 (My grandpa's) is a possessive marker, therefore follow it with a noun '全身' is grammatically correct. But 的 can be omitted here
我爷爷的全身 = 我爷爷全身
Native Chinese would write "我爷爷全身[都]很疼" [所以]他不能去游泳” (My grandpa's whole body is [all] in pain, [therefore], he can't go swimming)