Thread:PredatorFish/@comment-29212138-20170723214415/@comment-29773086-20170725200101

"Glorfindel himself was reluctant; only for his allegiance and kinship with Turgon did he go, and had no part in the Kinslaying of Alqualondë."

That's from Tolkien Gateway, if that's enough to convince you they were related, Fish. If not, I'll find the relevant passage in The Silmarillion.