What does this sentence say in English?

El hermano de Juan dice "De parte de quién?"

the brother Juan says

from who's part

Explanation:

of I put it in a sentence

Una Carta de parte de quien

in English it is

A letter from who's part like saying who sent this letter

¡hola!

i don't know how many words are missing

es verdad que acá en el mes de septiembre.

means

it's true that here in september.

so i guess it's ►

es verdad que el verano termina acá en el mes de septiembre.

it's true that summer ends here in september.

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