Well, all of this "begating" business is ages old
and variations show up in various spiritual texts and is not
meant to be taken literally anyway. They are
representations of our human and spiritual inclusiveness.
The same type of thing shows up in various sutras for instance.
The Samantabhadra Sutra, the Daihokobutsu Kegon Sutra,
the Lotus Sutra, the Diamond Sutra, et al.
began with the words, "Thus I have heard"
so as not to claim unnatural specifics.
Rod