David points out many times in several books Mike's position in the line for the Crown.  I have wondered about this line and tried to work out how it would go.  The first 3 are easy to figure due to their direct relationship to Elisbeth, but then there is a hole.

1. Crown Prince Roger

2. Priincess Joanna

3. Duke Michael

4. ?

5. Mike

Would that 4th person be Mike's mother, Lady Caitrin Winton-Henke, and if so How would it effect the constitutional clause of the monarch required to marry a commoner?

Just thought I would throw that out there and see what you thought.