when I have / am having breakfast my husband reads / is reading a newspaper

Hello!

Please, help me understand the right choice of the tenses. Which is right, or what is the difference if they are all right:

1. When I have breakfast my husband reads a newspaper;
2. When I have breakfast my husband is reading a newspaper;
3. When I am having breakfast my husband reads a newspaper;
4. When I am having breakfast my husband is reading a newspaper?

Thank you!