An old article, but it quotes the McCanns.......I hope it gives some clarification to the defamation claims.
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In a statement sent to Lusa in London, the McCann family says the legal action was prompted by "continuous and coarse defamatory statements [Gonçalo Amaral], uttered in various media in Portugal and abroad, that Madeleine is dead and that her parents were somehow involved in the concealment of his corpse. "
The main objective, still, is' to prevent further publications of coarse and defamatory book Gonçalo Amaral "Maddie - The Truth of the Lie", his alleged television documentary, and any repetition of his deeply offensive thesis that we are, somehow involved in the disappearance of our very beloved daughter Madeleine ".
The McCanns complain about the "negative effect of their absurd and extremely damaging statements, searches and other actions that remain, to find Madeleine."
"We can not stand still to do as Mr Amaral tries to convince the world that Madeleine is dead. We can not allow this injustice to Madeleine and attempts to find her, continue 'justified.
As to whether the children were also complainants, the reason is the "negative effect that such statements will undoubtedly have in their future lives."
http://www.tsf.pt/PaginaInicial/Vida/Interior.aspx?content_id=1235045