tinamini, itiou haha ni mo syasin wo misetara, kono heya nara ansin da ne to itte kureta.

ちなみに is a discourse marker meaning something like by the way, incidentally, or for your information.

It does not change the core grammar of the sentence. It tells the listener that the speaker is adding a related side comment.

So the sentence is not just giving the main information; it is adding an extra detail: By the way, I also showed the photos to my mother...

一応 is a very common and very nuanced word. Its meaning depends heavily on context.

Common shades include:

• for now
• just in case
• at least
• as a formality
• more or less

In this sentence, 一応 most likely means something like:

• just in case
• just to be safe
• as a precaution

So the speaker is saying they showed the photos to their mother too, not necessarily because it was absolutely required, but as a sensible extra step.

When talking about your own mother to someone else, Japanese often uses 母.

A rough pattern is:

• 母 = my mother, used in neutral/external reference
• お母さん = mom / mother, often used when addressing her directly or speaking in a warmer, more personal way

So 母 here is natural because the speaker is referring to their own mother in narration.

Also, Japanese often omits my when it is obvious from context, so 母 already naturally means my mother here.

にも is に + も.

Here:

• に marks the person something is shown to
• も means also / too

Since 見せる means to show, the person receiving the thing shown is marked by に.

So:

• 母に見せた = showed it to my mother
• 母にも見せた = showed it to my mother too / also showed it to my mother

The も emphasizes that the mother was an additional person the speaker showed the photos to.

Yes, exactly. 見せる means to show.

That means:

• 写真を見る = to look at the photo(s)
• 写真を見せる = to show the photo(s)

In this sentence, the speaker is the one doing the showing, and the mother is the person being shown the photos.

So 母にも写真を見せたら means when/after I showed the photos to my mother too...

It can, but here it is more natural to understand たら as when or after.

～たら often has two major uses:

• conditional: if
• temporal/resultative: when / after doing X, Y happened

In this sentence, the second half is the mother's reaction after seeing the photos, so the meaning is closer to:

• when I showed her the photos
• after I showed her the photos

It is less about a hypothetical condition and more about the result that followed.

なら adds a sense of if it's..., as for..., or in the case of...

So:

• この部屋は = as for this room...
• この部屋なら = if it's this room / as long as it's this room / in the case of this room...

Here, the mother is evaluating the room based on what she saw in the photo. The nuance is something like:

• If it's this room, then I can feel okay about it
• This room, at least, seems reassuring

So なら makes the judgment feel more conditional or situation-based than plain は would.

安心 is commonly treated like a na-adjective or adjectival noun in sentences like this.

That is why it can appear as:

• 安心だ
• 安心です
• 安心な場所

In this sentence, 安心だ means something like:

• it is reassuring
• it puts me at ease
• I can feel at ease about it

It does not always mean literal physical safety. Very often it means peace of mind or relief.

So the mother is saying the room seems like something she can feel comfortable or reassured about.

ね adds a soft, shared, confirming tone.

Depending on context, it can sound like:

• you know
• isn't it
• right
• gentle agreement-seeking

So 安心だね is softer and more natural than just 安心だ.

It sounds like the mother is warmly saying something like:

• This room seems okay, doesn’t it
• I can feel at ease about this room

It makes the comment sound less blunt and more conversational.

This is a very important nuance point.

• と言った = said
• と言ってくれた = said it for me / said it, and I appreciate that

The ～てくれる pattern shows that someone did something in a way the speaker sees as beneficial, welcome, or kind from the speaker's point of view.

So 言ってくれた does not just report the mother's words. It also suggests that her saying that was reassuring or helpful to the speaker.

It gives the sentence a warmer feeling, as if the speaker is glad to have received that comment.

Yes — Japanese often omits subjects and other obvious elements.

In this sentence, the understood participants are:

• I showed the photos to my mother
• my mother said この部屋なら安心だね

So even though I and she are not explicitly stated, the flow makes them clear.

A native speaker naturally fills them in from context:

• [I] showed my mother the photos
• [she/my mother] said this room seemed reassuring

This kind of omission is extremely normal in Japanese.