Question

My brothers like to play baseball.
A mis hermanos gusta jugar al béisbol

Answer 1

A mis hermanos les gusta jugar al béisbol

Answer 2

I'm a native Spanish speaker, so I don't know how to explain to a English speaker why you should repeat the indirect pronouns. I think this page might help you

http://www.studyspanish.com/lessons/gustar.htm

Answer 3

When your using the verb gustar you have to have the indirect pronouns before conjugating gustar
Yo me
Tú te
Él/ella/usted les
Nosotros nos
Vosotros os
Ellos/ellas/ustedes les

Answer 4

Él/ella/usted is le sorry

Answer 5

But if you have my brothers like to read books you would say
A mis hermanos les gustan los libros
les goes with A mis hermanos, (from of ellos) and gustan goes with the books gustan needs to be this way because there is more than 1 book

Answer 6

your right