Everyone wants a Yorkie! Why, because they are so cute!!!
I would print out all the needs of the breed.
We have Princess, but we have a big dog too.
I don't have any problem leaving Mandy for a few hours.
But Princess, NO WAY, if I go she goes. I even take her to Vons
if my husband isn't home. Mandy & Princess are best friends,
Princess has no idea Mandy out weighs her by 100 pds. If your in-laws
can give all the time and attention to a Yorkie, I'd say great, because
big and small do get along. As long as they are treated like family. But if they are going to be gone a lot, I would print out the needs of Small furbabies, so they can see, it's not just having a cute baby. You know, I'm a Grandma
but I heard Grandmas are the one's who get to spoil and then return. Being new at this, I'm not sure. But you might want to work the Grandma theme with them.
Good Luck!!!!