Originally posted by obliviuos
If I understand you correctly, your father believes he is of Basque ancestry, but in your family tree you see plenty of surnames commonly associated with the Sephardic Jewish community. A yDNA test, with a sufficient number of markers, should resolve that issue.
For example, you could order through the Iberian DNA Project:
Membership in the project does not require any approval (only an order and payment). I suggest you order at least 37 markers (Y-DNA37, for $189), so that if indeed your patrilineal line (your father's father's father's father...) is Sephardic, your results should find some fairly close matches in FTDNA's database.
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