They are distributed around the global oceans. They live in the temperature and tropical waters of the Pacific and Atlantic oceans and every sea that has this kind of waters.
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The Relative Clause is “who are five in number”. It is a type of dependant clause (it need the main clause in order to convey its meaning properly) that has the same function of an adjective; that is to say, it modifies a noun “friends”.
Even though Swift is not suggesting that the rich people in Ireland start eating the babies of the poor, he is still suggesting some realistic solutions. Most of all he is pointing out that the rich need to start doing something to balance out the economy and support the lower classes, instead of treating them like cattle. Comparing them to cattle by suggesting they eat babies points out this flaw of society and that it needs to be changed.