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Re: King Juan Carlos grandchildren
User logged in as Charles
If I understand correctly, in the UK only the eldest son of the reigning monarch is a prince (presumably by right); younger sons are styled by the title only by courtesy.
So it seems that the British system of courtesy titles is equivalent to the Spanish system of Infantes by grace.
You are incorrect; the British princely title is not a courtesy title. The children of the monarch are all princes by right of birth, as are the male-line grandchildren, and the children of the eldest son of The Prince of Wales.