It's odd the twists of history.
D.Maria Pia had bought a chalet at Monte Estoril, near fashionable Cascais where her husband D.Luis reformed the Citadelle Governor's house and turned it into the family holidays house by-the-sea (and where D.Luis incidentally died).
After the fall of the monarchy, Her chalet eventually was bought by the Herédias, the family of Viscount of Ribeira Brava who was implicated in the regicide as he had provided the funds to the republican revolutionaries.
The Herédias still own the chalet, facing the sea, and one of the members of the family, from a younger branch, is the present Duchess of Braganza, D.Isabel de Herédia