How many sons did Yang Jiye have in history?

Historically, Yang Ye had seven sons. Except Yan Yu, who died with his father, all the other sons have died for their country, the most famous of which is the sixth son Yang. The names of these seven sons are: six sons Yang, seven sons, five sons Yang Yande, eldest brother, second son Yang Yanshun, third son and fourth son Yang Yanlang.