Guidance for fellowship issues
Can you point to any literature or guidance for fellowship issues with a spouse of a different denomination? I'm specifically concerned with the practical aspects like giving thanks for a meal, or praying together as a family.
You could benefit from reading Church Fellowship: Working Together for the Truth. There is a short section on the application of scriptural fellowship principles to “Family and friends.”
It is possible your pastor or church library has a copy of the book that you can borrow. If not, the book is available from Northwestern Publishing House.
Your pastor may have other resources at his disposal. Do contact him as well.