I have family from both da Silva and de Medeiros from Mosteiros, Sao Miguel. I go back to Francisco da Silva born abt 1830 in Mosteiros, married to Ana Rosa (unknown).
On the de Medeiros side, I go back to Francisco de Medeiros born abt 1800, married to Antonia Francisca (unknown) parents of Jose Francisco de Medeiros born 1823 Bretanha, Sao Miguel. Ellen