Good news... I found the parents for Rita Clara de Jesus Goulart and her husband José Nunes Furtado - including the link into two more generations (but the documentary evidence seems to stop in 1670 on Pico). I will add the additional But, I see no explanation for where the "da Silveira" comes from here. Perhaps that gives us a clue for finding another generation!
@George J. Homes…acrescentei alguma informação, que retirei do meu site de família myheritage, "Vianas"…o que lá está está bem documentado, contudo de facto os Silveiras, até ver, passam a descender dos Francisco Goulart Teles