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I would check with fred olsen but we had a brochure the other day about family cruising and they didn't seem to have much for families/children at all, my inlaws go with them and they say you don't get many children on board. try p and o they have great youth departments on their family ships, our kids love it.
We have just returned from sailing on the Balmoral and didn't see any facilities for children.. in fact, I think there were less than 6 children on the cruise. Fred Olsen cruises seem more geared up for the older clientelle!