On the word "Ye" in Mulan's poems

The ancient "grandfather" generally refers to the older generation. In ancient times, due to the emphasis on address and etiquette, after thousands of years of evolution (at that time), in order to make up for the seriousness between honorifics and make them not too frivolous, "ye" was used. Now, due to the perfection of social system and close interpersonal relationship, it is called dad. )