under the stock attribution rules of 318(a) children are deemed to own the stock of their parents (even if they are adopted children)
so based on what you indicated, all employees are key employees
note: of course, the document is important!!!!! for instance if item (ii) was checked rather than (I) then top heavy is still due!
8. Top-Heavy Allocations
Top-Heavy allocations are made to
a. [ X ] This Plan. Participants who share in Top-Heavy minimum allocations:
i. [ X ] Non-Key only. Any Participant who is employed by the Employer on the last day of the Plan Year and is not a Key Employee
ii. [ ] All Participants. Any Participant who is employed by the Employer on the last day of the Plan Year
iii. [ ] Participants covered by a collective bargaining agreement will share in Top-Heavy minimum allocations provided retirement benefits were the subject of good faith bargaining.