Hello Cmodena,

You will be able to apply for the Spanish nationality based on your Latin American nationality providing that is your nationality by origins: that is, that you are originally from Brazil. The fact that you are using your British passport in order to access a residency status in Spain more easily won´t affect your right to apply for the Spanish nationality, as long as you are holder of a Latin American passport by origins.

If you wish to discuss further, please feel free to use our contact form.