jumalmada halmeoni daege gamyeon harabeojiga chareul kkeulhyeo juseyo.

주말마다 means every weekend.

The particle -마다 attaches to a noun and means every or each:

• 주말마다 = every weekend
• 날마다 = every day
• 사람마다 = each person / everyone

So here it shows that this is a repeated or habitual situation.

In Korean, possession is often shown just by putting two nouns together, especially with family words.

So:

• 할머니 댁 = grandmother’s home
• literally, grandmother home

Using 의 is grammatically possible in many cases, but it is often omitted in natural Korean, especially when the relationship is obvious.

댁 is an honorific word for house/home.
It is used when talking respectfully about someone else’s home, especially an older person or someone deserving respect.

So:

• 할머니 집 = grandma’s house
• 할머니 댁 = grandma’s home, with a respectful tone

Because the sentence talks about grandparents, 댁 sounds more polite and natural.

The particle 에 marks the destination of movement with verbs like 가다 (to go).

So:

• 할머니 댁에 가다 = to go to grandma’s house

With 가다, 에 is the normal particle for to.

가면 is 가다 + -면, and -면 means if/when.

In this sentence, because the action is habitual, it is most naturally understood as:

• when I go
• whenever I go

So although -면 can literally mean if, in repeated situations it often sounds more like when/whenever in English.

Yes. Korean often leaves out subjects when they are obvious from context.

So 가면 here is understood as:

• (제가) 가면 = when I go

You do not need to say 저는 or 제가 if the listener can easily understand who is going.

-가 marks 할아버지 as the subject of the main action: he is the one who makes the tea.

So:

• 할아버지가 차를 끓여 주세요 = grandpa is the one who makes tea

If you used 할아버지는, it would sound more topical or contrastive, like:

• As for grandpa, he makes tea
• possibly contrasting him with someone else

In this sentence, -가 is a straightforward choice.

Here it means tea.

Even though 차 can mean both tea and car, the verb makes the meaning clear:

• 차를 끓이다 = to boil/brew tea

A car would not make sense with 끓이다, so the meaning is clearly tea.

끓이다 literally means to boil or to cook by boiling, but in everyday Korean it can also be used for preparing hot drinks or something boiled in water.

So 차를 끓이다 can mean:

• to boil tea
• to make/brew tea

Depending on context, English usually translates this more naturally as make tea rather than boil tea.

Not in this sentence.

This is a very common point of confusion. 주세요 can look like the request form please give/do, but here it is part of the honorific verb 주시다.

The structure is:

• 끓여 주시다 = to kindly make/brew something for someone

So:

• 할아버지가 차를 끓여 주세요 = Grandpa kindly makes tea for me/us

It is not telling grandpa Please make tea.

If you were requesting it directly, you would say something like:

• 할아버지, 차 좀 끓여 주세요. = Grandpa, please make some tea.

It is understood rather than stated.

In Korean, -아/어 주다 means doing something for someone, and that person is often omitted if it is obvious.

So this sentence implies something like:

• 할아버지가 (저에게) 차를 끓여 주세요
• Grandpa makes tea for me

The 저에게 is left out because Korean often omits information that can be guessed from context.

Yes, it is polite and respectful.

You can see that in several places:

• 댁 is an honorific word for house
• 주세요 here comes from honorific 주시다
• the sentence talks about grandparents in a respectful way

So the overall tone is natural and polite, especially when speaking about elders.