I request an opinion on a modeling problem

I've got three objects.
1. Parent Company
2. Subsidiary
3. User

I collapsed the parent/subsidiary into one dimension. I'm not sure what to do with user. A user can belong to a parent, a subsidiary, or both. I thought about snowflaking the User dimension and just putting in flags to indicate were the user belonged. Thoughts?

Its a business state. It is handled with a fact table that contains user & parent/subsidiary as dimensions.

See I thought this looked like a factless fact table but I'm not quite certain I'm following. How exactly would you indicate that a user might belong to just one entity in the company hierarchy? I may have my parent/subsidiary table not modeled properly.

dim_user(user_ck PK)
dim_business(business_ck PK, parent, subsidiary)

now the fact table looks like:
fact_user_employer(user_ck FK, business_ck FK)

In this case I can only see that a user belongs to both. What am I missing?

Create a row where the Parent Company is also the subsidiary. Might change the name a little to show the Parent Company in this instance only contains users with direct relationships.