Upon further reading in the Sil it becomes clear that Finarfin's heirs also fell under the curse.
Quote:
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(129)Then the sons of Finarfin departed from Menegroth with heavy hearts, perceiving how the words of Mandos would ever be made true, and that none of the Noldor that followed after Fëanor could escape the shadow that lay upon his house.
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Grim words.
So all the Noldor were under Mandos' curse that was sanctioned by Manwë, as a result of the Slaying of Alqualondë.
Only the sons of Fëanor were bound by the oath of the Silmarils. However, Fingolfin's house, by his oath to follow Fëanor wheresoever he leads, does play into this oath. Complicated.
Now here's a question: How did the lies of Morgoth get spread, with him holed up in Thangorodrim during that centuries long siege?
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