By Sam Elliott-Gibbs Move over Prince William and Harry \- Denmark has its very own warring royal sibling saga and it is also playing out on a very public stage. The family are reportedly in “meltdown” over the rivalry and while there are some striking similarities between the disagreements in Scandinavia and in Britain, one claim puts Megxit very much in the shade. When Prince Frederik becomes King Frederik the 10th on Sunday, following the sudden abdication of his mother, Queen Margrethe II, his brother Joachim’s wife and children will not be there. Royal fans will remember back to last year…