"Ancestors," the plural, as I've noted before, does not require an apostrophe. Further, if you're referring to "ancestors," plural, then you must refer to multiple people, and King George V was an individual.

I've read between the lines, and perhaps I discovered information you were not aware you included. I'm pretty good at drawing inferences.

Oh, good grief, the darn letter. Meghan wrote that letter when she was 11 years old. That demonstrates an unusual amount of awareness of social issues and the willingness to address them at an unusually early age. Most 11-year-olds are not capable of such. Good for Meghan!