You are a foster Mom whether you wanted to or not
Yorkies should have foster moms who know the Yorkie breed and you do, so that is great!
First thing a foster mom would do is keep the newbie away from your Yorkie until you take the newbie to a vet.
They are having peeing wars because they are male in the same house. Belly bands on both would help that.
Not knowing what toys are would indicate a puppy mill stud but could indicate a dog no one played with.
Being so quick to love you indicates he simply had bad owners. (or was stolen) A dog like him is looking for a human to love him and restore his trust in humans.
Husbands? Yeah, have that same issue. Join a local Yorkie rescue if there is one, as they can sometimes reimburse you for vet bills and food. Foster him and reenforce good Yorkie behavior while a new home is looked for. A Rescue could help with that.
Rescues always need fosters. Each new owner is cleared and checked out. I am a member of NCYorkie Rescue. Happy to answer any other questions.