bousai no hanasi wo site itara, haha ha konya no uti ni kyuukyuubako wo mou itido kakuninsuru to iimasita.

Here 〜ていたら comes from 〜ている + たら.

• 話をしている = to be talking / to be having a discussion
• 話をしていたら = when/while we were talking, or if we were talking

In this sentence, it is most naturally understood as when/while we were talking about disaster preparedness.

So the nuance is:

• a conversation was already in progress
• then, as a result of that situation, the mother said something

It is not a simple past like 話したら. The 〜ていた part shows an ongoing action in the past.

Both are possible.

• 話す = to speak / to talk
• 話をする = to have a talk / to have a discussion

So:

• 防災の話をしていたら sounds like while we were having a conversation about disaster preparedness
• 防災について話していたら would also be very natural
• 防災を話していたら would not be correct

Using 話をする is very common in Japanese when talking about having a conversation on some topic.

Here の links two nouns.

• 防災 = disaster preparedness / disaster prevention
• 話 = talk, story, discussion
• 防災の話 = a discussion about disaster preparedness

A good way to think about this の is:

• X の Y = Y related to X

So 防災の話 is literally something like a disaster-preparedness discussion or talk about disaster preparedness.

今夜のうちに means before tonight is over or sometime during tonight, while it is still tonight.

Breakdown:

• 今夜 = tonight
• うち = within; during the span of; while it still counts as
• に = marks the time limit/point by which something will be done

So 今夜のうちに確認する means:

• check it before tonight ends

This is a little more specific than just 今夜.
It emphasizes finishing the action within that time frame.

The difference is nuance.

• 今夜確認する = I will check it tonight
• 今夜のうちに確認する = I will check it before tonight is over

The second one stresses the deadline or limit more clearly.

It can feel like:

• I should get this done tonight
• I want to finish this while there is still time tonight

は marks 母 as the topic.

So 母は means something like:

• as for my mother
• my mother, ...

In this sentence, は is very natural because the sentence is about what the mother said after the conversation topic was introduced.

Also, は can carry a slight contrastive feeling depending on context, such as:

• others may have reacted differently, but my mother said this

That said, here it mainly works as a normal topic marker.

Yes. In Japanese, family words like 母, 父, 兄, and so on often refer to the speaker’s own family member without needing a word for my.

So:

• 母は ... と言いました = My mother said ...

Japanese often leaves that kind of possession understood from context.

Before と 言いました, Japanese usually uses the plain form to show the content of what was said.

So:

• 確認する = plain non-past form
• 確認すると言いました = said that she will check / said, I’ll check

This does not mean present tense in the English sense. In this context, the non-past form expresses a future action.

Why not 確認した?

• 確認した would mean checked
• but the mother is talking about something she plans to do later tonight

Why not 確認します?

• You can quote polite speech, but in ordinary reported speech Japanese often uses the plain form inside the quote/content clause

Here it means will check.

Japanese plain non-past forms can cover:

• habitual actions
• present/future actions
• dictionary-form meaning

In this sentence, the context makes it future:

• the mother said she would do it 今夜のうちに
• so 確認する = will check

もう一度 means once more or again.

In this sentence it modifies 確認する:

• 救急箱をもう一度確認する
• check the first-aid kit one more time

It shows that the mother wants to re-check it, not check it for the very first time.

Its position is flexible, but here it sits naturally right before the verb phrase it modifies.

救急箱 means first-aid kit or first-aid box.

• 救急 = emergency / first aid
• 箱 = box

It is commonly read きゅうきゅうばこ.

So 救急箱を確認する means checking the contents or readiness of the first-aid kit.

It can function as either, but in this sentence it is most natural to understand it as reported speech:

• Mother said that she would check the first-aid kit again tonight

Japanese does not always clearly separate direct and indirect quotation the same way English does.

So X と言いました can mean:

• said X
• said that X

Here, without quotation marks and with the plain form inside, it reads very naturally as reported content.

Grammatically, 〜たら can sometimes mean if or when, so that confusion is very common.

But in this sentence, when/while we were talking about disaster preparedness is the better reading.

Why?

• the sentence describes a natural sequence of events
• during that conversation, the mother responded by saying something

So this is not really a hypothetical if situation. It is a real event that happened.