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Answer to the sister ship of Titanic is incorrect. It was Olympic, as I thought. There was a third sister ship called Brittanic, but Lucitania was not.
The Titanic had two sister ships, one named the RMS Olympic and the other the HMHS Britannic. There was never a Lusitania sister of the Titanic, the Lusitania was actually from a rival company. The Lusitania belonged to the Cunard Line, while the Titanic belonged to the rival White Star Line.