I saw something like this on TV on the Dog Whisper, but it was a mom the daughter..... What they said it was the moms fault for correcting the daughter instead of the Yorkie.
Once the dog was put in its place as second after the child , the child and Yorkie developed a friendship.
I made my sister watch this and made her put her maltese in check before she bite a family member, because she would get real bad with all males in the house.
But it must be her that corrects her Yorkie
not you.
Best of Luck