W*E*L*C*O*M*E!
I can't believe that your cousin breeds Yorkies and this is only your first one! Be prepared, they are very addicitive. I already want another and I just got my first 3 weeks ago
As far as kids and Yorkies, alot of people say they don't mix well. I disagree. I have a 6 yr old, a 4 yr old, and a 3 yr old. They are soooooo careful with and around Missy. I really think it depends on the kid.
Make sure to post pics when your baby is there. You must be about ready to burst waiting for him to arrive.