Francisco later married Teresa de Carvalho, the daughter of a wealthy merchant who had left Lisbon with the Portuguese court.

António inherited a huge family fortune, which he enlarged in Brazil by selling coffee and precious stones, which soon made it possible for him to leave for Portugal.

In addition, he was involved with his father in the foundation of the Lisbon Zoo and served as executive director and honorary president in 1917.

Carvalho Monteiro was represented in the press of his time as both an altruist and an eccentric, exemplified by his famous Leroy 01, claimed to be the most complicated clock in the world.

Carvalho Monteiro had the same architect who built the Palácio da Regaleira, Luigi Manini, build his tomb in the Prazeres Cemetery.