A spouse can not be forced to testify against the other spouse.
I am sure that with enough money and a good set of lawyers that law could be changed based on the above law.
But then again...if a dealer, family member or not is in my house...I will call the police.
There was a law that came out in the late 60s early 70s. Before the law..if you were as much as in the same house with a person smoking pot...you would get arrested along with them. The new law said that the person holding was the only one who could be arrested.
If a person is a partner in the working of a crime...they have brought trouble onto themself.
Family member or not...if they are a dealer.... 911