Miaj gefratoj ofte parolas unu kun la alia.

Gefratoj means siblings or brothers and sisters.

The prefix ge- is used when talking about a group containing both males and females. So:

• frato = brother
• fratoj = brothers
• gefratoj = brothers and sisters / siblings

So if the speaker means a mixed group of siblings, gefratoj is the natural choice.

Because miaj has to agree with the noun gefratoj, which is plural.

In Esperanto, adjectives and possessive words like mia behave like adjectives, so they match the noun in number:

• mia frato = my brother
• miaj fratoj = my brothers
• miaj gefratoj = my siblings

The -j shows plural.

The ending -j marks the plural in Esperanto.

So:

• gefrato = one sibling
• gefratoj = more than one sibling

Since the sentence is about multiple siblings, the noun needs -j.

Parolas is the present-tense form of paroli (to speak).

In Esperanto:

• -i = infinitive, like to speak
• -as = present tense, like speak / are speaking

So:

• paroli = to speak
• parolas = speak / are speaking

Also, Esperanto verbs do not change depending on the subject. So:

• mi parolas = I speak
• li parolas = he speaks
• ili parolas = they speak

The verb form stays the same.

Because the subject is already stated: Miaj gefratoj.

Esperanto does not need a pronoun if the noun itself is the subject. English works the same way:

• My siblings often speak to each other.
• You would not normally say My siblings they often speak...

So miaj gefratoj already tells us who is doing the action.

Ofte means often.

It is an adverb, and adverbs in Esperanto often come before the verb they modify:

• ofte parolas = often speak

The placement is fairly flexible, but this position is very common and natural.

Unu kun la alia literally means one with the other, but in natural English it means with each other.

It is a common Esperanto way to express a reciprocal action—something people do mutually.

So:

• Miaj gefratoj ofte parolas unu kun la alia. = My siblings often speak with each other.

In this reciprocal expression, Esperanto normally uses la alia:

• unu kun la alia
• literally: one with the other

This is a set pattern. The la helps make it mean the other one, not just another in a vague sense.

So unu kun la alia is the standard way to say with each other in this structure.

Yes. The preposition changes depending on the verb or meaning.

For example:

• ili parolas unu kun la alia = they speak with each other
• ili donas donacojn unu al la alia = they give gifts to each other
• ili pensas unu pri la alia = they think about each other

So the pattern is often:

• unu + preposition + la alia

The preposition is chosen based on the relationship you want to express.

Yes, it is a normal and correct sentence.

A learner might also see other ways of expressing a similar idea, but this version is clear and idiomatic:

• Miaj gefratoj ofte parolas unu kun la alia.

It is especially useful because it shows the reciprocal structure very clearly.