The generation of the current patriarch, Zaol, at least, wasn't the same as his predecessors.
As to how the family created such a culture, it actually had quite a tragic history.
His father had a handful of women at his beck and call but, even so, only a few were born due to his high level.
Zaol had three other siblings, though mostly from different mothers, and he was actually the second child. Their age gaps were also quite big, sometimes with a decade or two apart from each other.
The oldest man—the former heir—was older than he was by over a decade. The man was a copy of their father, and acted completely like him.
He was borne from a frail woman sold by her family for some blus. Her level was not too high and it took about a decade of marriage before she got pregnant with him.
