What is Dora's brother's name?

Answer 1

One would have to assume that it could be Marquez, the same as Dora's last name. But since we don't know who's side of the family he is from we will never really know unless the author adds some information.

Answer 2

Diego is actually Dora's cousin. Her brother is Guillermo and his twin sister is Isabella.

Answer 3

yes they are
Yes.

Answer 4

Dora is Diego's cousin.

Answer 5

No, Dora and Diego are cousins.

Answer 6

Diego is Dora's cousin.

Answer 7

yes