Celeste created two Nevada LLCs in 2010, and unlike her son, appears to have managed to keep up the registrations on them as well.
Here's some details on them, from the Nevada Secretary of State's website.
1. COR-NRR, LLC
2. COR-KMC, LLC
The purposes of these LLCs are unknown, but in deciphering their names, may I put forward as a suggestion that Celeste apparently goes by both her maiden and married name, the initials of which give COR.
Looking at the title of this thread, Nick's initials are NRR, and KMC is consistent with his sister's first and last initials (KC).