Feanor and Fingolfin

Fëanor, already not fond of his half-siblings, had little trouble believing the rumor. Fëanor hastened to Tirion and confronted Fingolfin, drawing his sword and threatening him with violence. When it became known what Fëanor had done to Fingolfin, he was called by the Valar to explain himself, and Melkor's lies were found out. However, Fëanor was held accountable for threatening Fingolfin and was banished to the fortress of Formenos in the north.Around twelve years later, the two brothers reconciled at a festival in Valinor (though Fëanor did so only grudgingly).

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