Attorney Howard King wrote in a statement released late Tuesday that he will appeal a judge's ruling upholding a jury's copyright infringement verdict.
U.S. District Judge John Kronstadt trimmed the nearly $7.4 million verdict to $5.3 million on Tuesday but also ruled that Gaye's family should receive future royalties from "Blurred Lines."
King wrote that Williams, Thicke and T.I. did not use Gaye's music to create the song, which was the biggest hit of 2013.
A lawyer for Gaye's family said he was pleased but also was reviewing the decision to cut the damages award.