The daughter and son-in-law of an elderly couple who went missing from Mansfield in 1998 have appeared at Nottingham Magistrates Court and have been remanded into custody.
They will appear at the Crown Court on Monday.
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The Judge said "no sentence I can pass will ever feel like enough for this family."
The pool in Birmingham has been temporarily closed after a bug which can cause diarrhoea, vomiting and low-grade fever entered the water.
The three men were arrested by West Midlands Police counter terrorism officers and are due before Westminster Magistrates' Court in London.