kodomo wo kenka ni makikomanaide kudasai.

巻き込まないでください means please don’t involve ... or please don’t drag ... into ....

The dictionary form is 巻き込む, which often means:

• to draw someone into something
• to involve someone in trouble, conflict, or an event
• to drag someone into a situation they were not originally part of

So in this sentence, it means something like:

Please don’t involve the child/children in the fight.

It has a slightly stronger nuance than just include. It suggests pulling someone into an unpleasant or troublesome situation.

The particle を marks the direct object of the verb.

Here, the person being involved is 子供. In other words, the children are the ones being pulled into the fight.

So the structure is:

• 子供を = the child/children
• けんかに = into the fight
• 巻き込まないでください = please do not involve

A natural way to think about it is:

Don’t involve the children
→ 子供を巻き込まないでください

Then けんかに adds into the fight.

The particle に here shows the situation or context into which someone is being drawn.

So:

• けんかに巻き込む = to involve someone in a fight
• literally, to drag someone into a fight

This use of に is common with verbs that mean entering, joining, or being drawn into some state or situation.

Compare:

• 事件に巻き込まれる = to get caught up in an incident
• トラブルに巻き込まれる = to get dragged into trouble

So に is not marking the object. It is marking the target situation.

It breaks down like this:

• 巻き込む = dictionary form
• 巻き込まない = negative plain form, do not involve
• 巻き込まないで = without involving / don’t involve
• 巻き込まないでください = please don’t involve

This pattern is very common:

verb-ないでください = please do not verb

Examples:

• 食べないでください = please do not eat
• 入らないでください = please do not enter
• 話さないでください = please do not speak

So 巻き込まないでください is a polite request not to do something.

It is a polite request, but it can still sound quite firm.

〜ないでください is softer than a blunt command like:

• 巻き込むな = don’t involve them

But it is still clearly telling someone not to do something.

So depending on tone and context, it can sound like:

• a polite warning
• a serious request
• a firm instruction

In English, please don’t involve the children can also sound gentle or strong depending on the situation. Japanese works similarly here.

It can mean either child or children.

Japanese nouns usually do not have a built-in singular/plural distinction the way English nouns do. So 子供 may refer to:

• one child
• children in general
• a group of children

You understand the number from context.

So this sentence could mean:

• Please don’t involve the child in the fight.
• Please don’t involve the children in the fight.

Both are possible unless the wider context makes it clear.

The kanji form is 喧嘩, but it is very often written in hiragana as けんか.

That is common for words whose kanji:

• are difficult
• are less common in everyday writing
• may look too formal or heavy for normal text

So both are correct:

• けんか
• 喧嘩

In everyday Japanese, especially in learning materials or casual writing, けんか is much more common.

Yes, but it would change the nuance.

The original sentence: 子供をけんかに巻き込まないでください focuses directly on the children as the object of the action.

If you said: 子供はけんかに巻き込まないでください it would sound more like: As for the children, please don’t involve them in the fight.

That version gives 子供 topic or contrast emphasis. It can sound like:

• other people may be involved, but not the children
• speaking specifically about the children, don’t drag them in

So を is the most neutral and straightforward choice here.

A sentence like 子供をけんかに入れないでください would be understandable, but 巻き込む is more natural here.

Why?

Because 巻き込む specifically suggests:

• getting someone caught up in something
• dragging them into trouble or conflict
• involving them in a negative situation

By contrast, 入れる simply means to put in or to let into. It is more general and does not naturally express the idea of someone being unwillingly drawn into a messy situation.

So:

• 巻き込む = involve/drag into trouble
• 入れる = put in, let in

That is why 巻き込む is the better verb here.

The pattern is:

A を B に 巻き込む

meaning:

to involve A in B

In this sentence:

• A = 子供
• B = けんか

So:

• 子供をけんかに巻き込む = to involve the child/children in a fight

This pattern is useful with many nouns:

• 彼を問題に巻き込まないでください。
  Please don’t involve him in the problem.

• 子供を大人の事情に巻き込むべきではない。
  You shouldn’t involve children in adult matters.

• 彼女は事故に巻き込まれた。
  She got caught up in an accident.

That last example uses the passive 巻き込まれる, which is also very common.

Yes. The spaces are just for readability, probably for learners.

Normally, Japanese is written without spaces:

子供をけんかに巻き込まないでください。

Japanese does not usually separate words with spaces the way English does. Teaching materials sometimes add spaces to help beginners see:

• nouns
• particles
• verb forms

So the spaced version is not wrong as a learning aid, but in normal writing you would usually see it without spaces.