Indis

Indis was the second wife of Finwë and mother of Fingolfin and Finarfin. Through Finarfin, she is the grandmother of Galadriel, the great-grandmother of Celebrian, the great-great-grandmother of Elladan, Elrohir, and Arwen, and her blood continues on down the line of Gondorian kings.

Indis was also the stepmother of Fëanor, but he didn't like her or her sons very much.