Joao was born in Boulogne-Billancourt, France to Pedro de Alcantara, Prince of Grao-Para and Countess Elisabeth Dobrzensky de Dobrzenicz. His father had been a member of the Brazilian Imperial Family but had joined his mother Isabel, Princess Imperial of Brazil in exile after the abolition of the monarchy. When Joao was 19, he emigrated to Brazil.

Can we draw the following conclusion?
Joao has a mother.
Yes