I don't know why I always seem to forget that Daisy and CG are first cousins, but I thought it was so cute that he calls her "Dear cousin Daisy" as well as hearing Felipe call her Aunt Daisy! I really love how close the Continental royals are and always thought it was a shame that the way George V adopted an almost isolationist policy toward his foreign cousins after WW1 that sort of endured into the next generations.
Have to add, it's really interesting to me to hear Felipe speak in English. His accent sounds a lot like his Uncle Constantine and I'm not sure I would even know Spanish was his native language because his English doesn't really have a Spanish accent to it the way Leti's does.
Wasn't there a rumour that Sofia spoke english with her children?