When people are questioning the background of their dog, Yorkie vs Silky, I also like to reference the google images for Silky Terriers. It's easy to see how similar they are to Yorkies, but also how very different they are. There are a few mixes in here and a few Yorkies, but for the most part, the Silky characteristics really start to show up when you can see images from different Silkies from everyday ways of life.
silky terrier pictures - Google Search