sinseki no ie ni iku mae ni, edamame to yakitori wo suupaa de kaimasita.

Literally, 親戚の家 is something like relative's house or relatives' house.

The particle の links two nouns and often shows possession or association. So:

• 親戚 = relative(s)
• 家 = house, home
• 親戚の家 = a relative's home / the home of relatives

Japanese does not force you to mark singular vs. plural here, so 親戚 could mean a relative or relatives, depending on context.

Because 行く means to go, and に marks the destination.

So:

• 家に行く = go to the house
• 学校に行く = go to school
• 日本に行く = go to Japan

Here, 親戚の家に行く means to go to a relative's house.

With 前に meaning before, Japanese usually uses the dictionary form of a verb before it when you mean before doing something.

So:

• 行く前に = before going
• 食べる前に = before eating
• 寝る前に = before sleeping

You do not normally use the past form there.

A useful rule:

• Verb dictionary form + 前に = before doing that verb

前に means before.

In this sentence, the part before it is a verb phrase:

• 親戚の家に行く前に = before going to a relative's house

So the whole sentence says that the buying happened first, and the going to the relative's house was the later event.

You can use 前に with different kinds of words:

• 食べる前に = before eating
• 出発の前に = before departure
• 3時前に = before 3 o'clock

Because で marks the place where an action happens.

Here, the action is 買いました = bought, and the buying took place at the supermarket.

So:

• スーパーで買いました = bought it at the supermarket

Compare:

• スーパーに行きました = went to the supermarket
  
  • に = destination
• スーパーで買いました = bought it at the supermarket
  
  • で = place of action

This is one of the most common particle contrasts in Japanese.

Because 枝豆と焼き鳥 forms one combined object phrase: edamame and yakitori.

So the structure is:

• 枝豆と焼き鳥 = edamame and yakitori
• 枝豆と焼き鳥を買いました = bought edamame and yakitori

The particle を marks the whole noun phrase as the object of 買いました.

This is very normal in Japanese. You do not need:

• 枝豆を焼き鳥を買いました → incorrect

Here, と means and and connects nouns.

So:

• 枝豆と焼き鳥 = edamame and yakitori

This と is used for a straightforward list of nouns. It sounds like a complete, specific list.

For example:

• パンと牛乳 = bread and milk
• 友だちと先生 = friend and teacher

So in your sentence, the speaker bought those two items.

Because Japanese normally puts the main verb at the end of the clause or sentence.

The sentence structure is roughly:

• 親戚の家に行く前に = before going to a relative's house
• 枝豆と焼き鳥を = edamame and yakitori
• スーパーで = at the supermarket
• 買いました = bought

The final verb tells you the main action of the sentence. This is very different from English, where the verb often comes earlier.

Because the speaker is describing a completed action: they bought the food.

• 買います = buy / will buy
• 買いました = bought

The sentence is telling you what happened before going to the relative's house. The buying is treated as a finished event, so past tense is natural.

Also, 買いました is in the polite -ます form, which is common in standard speech and writing for learners.

The subject is omitted, which is extremely common in Japanese.

A natural English translation might include I, but Japanese often leaves that out when it is obvious from context.

So this sentence could imply:

• I bought...
• We bought...
• sometimes even someone bought...

In many everyday Japanese sentences, the speaker does not state the subject unless it is necessary.

Japanese does not normally use articles like a or the, and it usually does not require plural marking the way English does.

So:

• 親戚 can mean a relative or relatives
• 家 can mean a house, the house, or home, depending on context

English forces you to choose things like singular/plural and a/the much more often. Japanese usually leaves that for the listener to infer from the situation.

Yes, to some extent.

Both of these are natural:

• 枝豆と焼き鳥をスーパーで買いました
• スーパーで枝豆と焼き鳥を買いました

Japanese word order is more flexible than English because particles show each word's role.

However, the verb usually still stays at the end, and some orders sound more natural than others depending on emphasis. In this sentence, both versions are fine, but ending with 買いました is the key point.