This is an incomplete list of Brazilian political families, also known as “oligarchies” ("oligarquias").
A.
The Alckmin family
The Arraes-Campos family
The Assed-Matheus (also known as Garotinho) family (spouses and children)
B.
The Barros-Borghetti family (spouses and daughter)
The Bolsonaro family (father and sons)
The Brás-Moreira family (cousins)
The Brizola family: Check under the “G” category
C.
The Cabral family
The Cardoso family of Minas Gerais
The Cardoso family of São Paulo
The Coimbra-Luz family
The Collor-Mello family
The Costa family
The Covas family
The Cunha Lima family
D.
The de Barros family
The Dias family (brothers)
F.
The Figueiredo family
The Fonseca family
The Franco family
The Fruet family (father and son)
G.
The Garotinho family: Check under the “A” category
The Geisel-Markus family
The Genro family
The Goulart-Brizola family (brothers-in-law)
J.
The Jobim family
K.
The Kleinübing family
The Kubitschek family
L.
The Lobão family (spouses and son)
The Lula da Silva family (spouses and sons)
M.
The Magalhães family
The Maia family 
The Malta-Ribeiro family
The Matarazzo-Suplicy family
The Mendonça-Vilaça family
N.
The Neves-Cunha family
Q.
The Quadros family
R.
The Ramos family
The Requião family
The Rezende family (spouses)
The Rousseff-Araújo family (divorced spouses)
S.
The Sarney-Macieira family
V.
The Vargas-Dornelles-Peixoto family