Hi! I have been to the websites of various Brazilian consulates in the US for this question. I think I know the answer, but I would like others to let me know if I'm reading it correctly.
Family reunification only applies to parent/child or spouse/partner. It can apply to siblings, but only if the sibling is a minor under the care of the the Brazilian sponsor or under the care of the parent who is applying. It DOESN'T apply to the adult sibling of the Brazilian sponsor, correct? It also DOESN'T apply aunts, uncles, cousins, etc, correct?
For instance, a Brazilian resident or citizen has a 20 year old half sibling who wants to move to Brazil, That would not met the conditions for a family reunification visa. Is this your understanding of it?