Full-time Employee with 2 sole proprietorships businesses (wife and I)

Hello everyone, 

Thank you very much beforehand for your advice and responses. 

 

The situation: I am a full-time employee and reside in California. My wife and I have started 2 different side businesses and are really confused about the tax process for our case.

 

I just started reading on the requirements for a sole proprietorship when it comes to taxes but have not found cases where there are 2. 

 

Your help is appreciated.