Rebecca Thomas, a dancer from Sutton Coldfield, is stranded on the cruise ship the Costa Allegra in the Indian Ocean after it lost power.
Her brother James Thomas, who is also a dancer, escaped from the Costa Concordia which sank in Italy last month.
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The husband of Claire and father of Charlotte suffered gun wounds to the head, described by the pathologist as "self-inflicted".
The weapons will now be used as part of a ‘Knife Angel’, a 26ft high sculpture against violence and aggression.
Anecdotal evidence shows that doing something creative can help people living with the disease, and even prompt them to remember things.