Relative clause - Help please!!

[Riseoftheflarelovers]

I've tried googling still none the wiser

DD has to write 20 sentences which contain relative clauses.

Her first one is :-

Mrs Brown, who lives next door, got on the train first.

Is that correct? She seems confused about the need for commas or not. Her learning target is to Write a sentence with a relative clause, underline the clause and RAG assess your learning (wtf?)

www.chompchomp.com/terms/relativeclause.htm
esl.fis.edu/grammar/rules/relative.htm
I think these explain it quite nicely. Whether or not you need the comma depends on the purpose of the relative clause. Is it needed to define your noun or does it simply add extra information?
Considering the example, she's possibly asked to practise adding information. Start with a simple sentence, identify the noun and provide more information about the noun by embedding the relative clause using commas. (Just guessing, though.)

RAG - Red, amber, green? How well does she understand it?

Relative clauses are introduced by relative pronouns, so that's right.

You only need commas if the information between the commas isn't necessary to the rest of the sentence.

So you have commas in your example because Mrs Brown got on the train first still makes sense.

RAG- red amber green. Traffic lights :)

Clear as mud?

The commas depend on what the relative clause is adding extra information to, and where it is in the sentence.
So

The dog, which was brown, ate the sausages.Two commas, embedded clause!

The sausages were eaten by the dog, which was brown. One comma, passive voice

Have you seen the people who we met on holiday? No commas!

I think!

Ah thank you all

She got there in the end.

Yep turns out RAG is just underlining your learning intention with a red/amber/green pen!

She did say though that she could only use Who or Which so

Mrs Brown WHO

or

The gorilla WHICH

is that correct? Who for a person and which for an object?

Which is correct in non-restrictive clauses I think. Use 'that' in restrictive clauses.

The who/which instruction is probably to stop children writing:
Mrs Brown, what lives next door, caught the train.
We often have children who use 'what' in these sentence types rather than who/which/that !