Retirement Plan and Key Employees

[Oh Baby!]

A husband and wife establish a retirement plan for a management company which they own 100% and are the only employees. The husband and wife also own 100% of multiple other companies, each of which has a number of employees. Does this plan meet the key employee tests, since all employees of the management company are covered? or do all the other employees of the other wholly owned companies also have be considered?

[OldJack]

All other related company employees have to be included in any retirement program of any of the related companies.