Prince Joachim and Princess Marie of Denmark appeared all smiles yesterday as they took their youngsters – Depend Henrik and Countess Athena – to an aquarium. The household paid a go to to the Kattegatcentret marine centre in Grenå, Denmark on Tuesday, to mark the attraction’s thirtieth anniversary.  The European royals appeared delighted to get pleasure from some household time of their homeland, forward of their relocation later this yr to Washington DC.  Prince Joachim, 53, is about to turn out to be the Defence Trade Attaché on the Embassy of Denmark within the US metropolis, sparking a brand new chapter for his household following Queen Margrethe’s resolution to strip his 4…