It depends which ship you are talking about but typically some cabins accommodate up to 4 people. The deck plans usually have a * or ** or !! to signify the number of beds a particular cabin has. The standard number is 2.
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Royal Caribbean - Independence of the Seas - 14 Oct 17 - 7nts
Southampton : Gijon : Bilbao : Cherbourg : Paris (Le Havre) : Southampton
Now from £579pp
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P&O Cruises - Ventura - 13 Nov 17 - 11nts
Southampton : Lisbon : Valencia : Cartagena : Gibraltar : Seville (Cadiz) : Southampton
Now from £599pp Was £639pp
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Princess Cruises - Caribbean Princess - 20 Apr 17 - 11nts
Southampton : Guernsey : Cork : Dublin : Hamburg : Rotterdam : Brussels : Paris : Southampton
Now from £999pp Was £1329pp
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