Why is there an old saying in Luoyang that "ancestors came from the west and mothers came from the east"?

This was changed by Shaanxi people, who obviously have the concept of "ancestors came from the west and ancestors came from the east". Qin Zhou, Gansu Province gave Shaanxi people "Qin", and Shanzhou, Henan Province gave Shaanxi people "Shaanxi".

Shaanxi's "Folk Songs" and "Wandering in Heaven —— Thinking of Grandpa and Mom"

The flower in Shandandan is in full bloom.

Red and gorgeous,

The kindness of our ancestors can't be forgotten!

Never forget,

The ancestors of the west!

My parents are from the east,

Give birth to eggs and marry a wife!

The cave is beautiful,

The waves on the heatable adobe sleeping platform,

The ancestors of the west,

My parents are in the East!

Give me a name,

Give me a last name!

My parents' kindness will never be forgotten!

Never forget!