Hi, Marvin. I did a quick search on Prince George and Last Laugh. Both stem from Parisian Flight, with very complicated lines and more than a few unknown or doubtful elements. However Condottiere figures highly in the parentage. I tried following that turquoise path through Daredevil, crossing it first with Navajo Jewel and then using the best seedling from that cross with Busy Being Blue and Pacific Destiny. All produced blue selfs--with no turquoise to be seen. Crossing those two: ((Busy Being Blue x (Navajo Jewel x Daredevil)) X ((Navajo Jewel x Daredevil) x Pacific Destiny)) failed to produce any turquoise either, but the result was a very nice reverse blue amoena with mid blue standards and white falls.
There was a German introduction several years back called Wondervu which was supposed to have turquoise elements, but I could never find any as it grew in my garden, nor in any of its offspring. So the search goes on....