I was sure of it so her mother was probably Emperor's sister but who could have been her father?
In chapter 36 we can see the portrait of the previous emperor and empress but in less detail
The previous emperor has brown hair
If the current emperor is the empress brother (aka he only related by blood to the empress who married into the imperial family)
Yiren is a full blooded royalty, her father the previous emperor.
Her bro and sister in law were trash the only good peoples she had were the children ar least they liked her...