Whose idea was this anyway?
Laeticia, Johnny's widow, wants the vault.
Johnny's biological children,
Laura Smet (mother: Nathalie Baye, Smet is Johnny's family name)) and David Hallyday (mother: Sylvie Vartan) have objected to reburial.
Laeticia was the sole heir with Johnny's and her two adopted children next in line if she were to die and the biological children were excluded in a will written under California law.
Laura and David, who by French law cannot be excluded from the will (without their consent) objected.
A French court has ruled Johnny was nomadic but a French resident and that the California will is not valid. This battle is ongoing.
Disagreements preceded Johnny's illness.
Other disagreements (e.g., regarding posthumous albums and tributes) are also ongoing.
(I think this summary is fairly accurate)