I think no? From what I remember, the mother's eye color are red (the one the other guild master with invisible snake thought of after seeing grue) and I think the person this woman calls zhenya.
Don't mind my comment. I'm wrong, I checked and the eyes are grey. Too far from being red. My memory is distorted sorry. And I can't delete this comment, I don't know how to delete it.
Dont worry its fine, nothing to say sorry. We both did not read the novel, and are just having fun making theories to make the manhwa more enjoyable.
Sooo that's the mom?