Sentence Correction

hi all,

first post here. i had a quick question regarding relative pronouns such as who, which, that, whose, whom, etc...

for relative pronouns that follow commas, does the relative pronoun have to be next to the subject that it modifies?

for example:

"the students at the school, who have been sick, are feeling better."

when "who" is a relative pronoun does this sentence work or does 'who' have to be directly next to the word 'students'? is the fact that 'who' is next to school does that mean this sentence is grammatically incorrect?

yes. who should refer to the noun coming just before the comma.

a post that I had noted down -

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'who' is used for both essential and non-essential details. The difference lies in COMMA use. COMMA is used when representing a non-essential part.

for example:
This is my uncle John, who lives in washington. => I just have 1 uncle and he happens to live in washington.

This is my uncle John who lives in washington => I have more than 1 uncle with same name John. But I am referring one who lives in Washington. Hence, Washington becomes essential part.
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as per my understanding. Experts - pls do correct