Last month two of Marvin Gaye's children filed a countersuit against Robin Thicke, Pharrell Williams and T.I. for sampling their fathers 'Got To Give It Up' in 'Blurred Lines'.  Now the music legends adopted son has filed another suit against the artists.

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Marvin Gaye's family claims that Robin Thicke copied the late soul singer's music to create 'Blurred Lines.'  In a move to protect himself from a lawsuit, Thicke filed a lawsuit against Gaye's estate and it has backfired.

Last month Frankie and Nona Gaye, filed a countersuit against Thicke, and collaborators Pharrell Williams and T.I. in response to the singers attempt at legal protection. Now according to The Hollywood Reporter, Gaye's adopted son, 36- year old Marvin Gaye III, has followed in his siblings' footsteps and has filed his own countersuit against Thicke.

The oldest of the singer's children, Marvin Gaye III, is accusing Robin Thicke of copyright infringement for sampling his father's "Got to Give It Up", along with three other tracks. Legal documents state that Thicke's songs — "Love After War," "Make U Love Me" and "Million Dollar Baby" — all use samples of Gaye’s orginal songs ("After the Dance," "I Want You" and "Trouble Man") and are "wholly dependent for their very creations upon Thicke's brazen copying."

(Photo by Stuart C. Wilson/Getty Images for MTV)

Robin Thicke admitted to being inspired by Marvin Gayes music in an interview earlier this year, but maintains that 'Blurred Lines' isn't a carbon copy of Gay's 71' classic.  Therefore he plans to challenge the countersuit.

Did Robin Thicke copy Marivn Gaye?  Should he be sued?