Police said Leonardo Rodrigues de Jesus, known by Bolsonaro supporters as Leo Índio, was one of the targets of a series of raids that led to 11 arrests in different states.
It was the first time a member of Bolsonaro’s family has been included in the investigations of the uprising in Brasilia, which underlined the political polarization in Brazil.
Police said those under investigation could be tried for crimes against democracy and criminal association.