We, as wuxia fans in the real world, have debated Gwok Jing vs. Yeung Gor ad nauseum, but what would have been the opinion of the one person who loved and admired both of them and had seen both of them in action: Gwok Seung? If you were to visit the mature Gwok Seung (i.e. around the time she became the founder of the Ngor Mei Sect) and asked her who would have won a fight between her father and her "big brother Yeung", what would her response have been?
For the sake of discussion, let's not have her give any coy responses (i.e. "Father and brother Yeung would not have fought each other" or "It's not important who was the better fighter", etc.). Let her answer in a straightforward, unequivocal way.