Anak-anak naik eskalator ke lantai dua mal sambil memegang tangan Ibu.

Because Indonesian often uses reduplication to show plurality or a group.

• anak = child
• anak-anak = children / kids

So Anak-anak means the children.
That said, Indonesian does not always have to mark plural. In the right context, anak alone could also mean children.

Here naik means something like go up, ride, or take, depending on how natural English sounds in context.

So:

• naik eskalator = take the escalator / ride the escalator
• naik ke lantai dua = go up to the second floor

Naik is a very common verb with a broad meaning related to upward movement or getting onto something:

• naik bus = take the bus / get on the bus
• naik sepeda = ride a bicycle
• naik tangga = go up the stairs

Both are possible, but they feel a bit different.

• naik eskalator is very common and natural in everyday speech.
• menaiki eskalator is more explicitly transitive and can sound a little more formal or more written.

So this sentence uses the more everyday pattern:

• naik eskalator

rather than:

• menaiki eskalator

A learner will hear naik + vehicle/object very often in Indonesian.

Ke marks direction or destination. It usually means to.

So:

• ke lantai dua = to the second floor

It shows where the children are going.

Compare:

• di lantai dua = on the second floor
• ke lantai dua = to the second floor

So di is location, while ke is movement toward a place.

Because those mean different things.

• lantai dua = second floor
• dua lantai = two floors / two storeys

This is a very common thing learners ask about.

Examples:

• rumah dua lantai = a two-storey house
• naik ke lantai dua = go up to the second floor

So in your sentence, lantai dua is correct because it refers to floor number two.

Because Indonesian often puts the main noun first and the thing that specifies it after.

So:

• lantai dua mal literally looks like floor two mall
• naturally, it means the mall’s second floor

This is similar to how possession or close noun relationships work in Indonesian:

• rumah saya = my house
• buku guru = the teacher’s book
• lantai dua mal = the mall’s second floor

A slightly more explicit alternative would be lantai dua di mal, but the original structure is natural.

Because mal is the standard Indonesian spelling.

Indonesian often adapts borrowed words to its own spelling system, so:

• English mall
• Indonesian mal

You may still see mall in brand names, signs, or informal writing, but mal is the standard dictionary form in Indonesian.

Sambil means while, while at the same time, or as ...

So:

• sambil memegang tangan Ibu = while holding Mom’s hand

It shows that two actions happen at the same time:

1. the children are taking the escalator
2. they are holding Mom’s hand

A very common pattern is:

• Verb 1 + sambil + Verb 2

For example:

• Dia berjalan sambil makan. = He/She walks while eating.
• Mereka tertawa sambil berbicara. = They laugh while talking.

Pegang is the base form, and memegang is the active verb form with the meN- prefix.

• pegang = hold / touch / grasp
• memegang = to hold

In a normal declarative sentence, especially in standard Indonesian, the active form memegang is what you expect when the verb has an object:

• memegang tangan Ibu = holding Mom’s hand

Using the base form pegang is possible in some casual styles or commands, but memegang is the standard choice here.

Because Indonesian usually shows possession by simply placing the possessor after the noun.

So:

• tangan Ibu = Mother’s hand / Mom’s hand

There is no separate word like English of, and there is no ’s ending.

This pattern is very common:

• buku saya = my book
• rumah Andi = Andi’s house
• mobil guru = the teacher’s car
• tangan Ibu = Mom’s hand

Because here Ibu is being used like a name or title, meaning Mom or Mother as a specific person.

So:

• Ibu with a capital letter = Mom / Mother as a family term or respectful title
• ibu with a lowercase letter = mother in a more general sense

Also, Ibu can mean different things depending on context:

• Mom / Mother
• Mrs.
• Ma’am

In this sentence, because of the family context, it clearly means Mom.

Indonesian often does not mark singular vs. plural unless it matters.

So tangan Ibu can naturally mean:

• Mom’s hand
• Mom’s hands, if context allows
• or simply the idea of holding onto Mom by the hand

In practice, English often does something similar too:

• The child is holding Mom’s hand.

With children, English might still say holding Mom’s hand even if the exact physical detail is not the main point.

If Indonesian wanted to be more specific, it could say:

• kedua tangan Ibu = both of Mom’s hands
• salah satu tangan Ibu = one of Mom’s hands

But the original sentence sounds normal as it is.

Because Indonesian does not have articles like English a/an and the.

So nouns such as:

• anak-anak
• eskalator
• lantai dua
• mal

do not need articles.

Whether something is understood as a, an, or the comes from context.

If Indonesian wants to be more specific, it can use words like:

• itu = that / the one we know about
• sebuah / seekor / seorang = a certain kind of a/an marker, depending on the noun

But in everyday sentences, articles are usually just omitted.