CRLLS
Thinks s/he gets paid by the post
Certainly a copy of the LLC Certificate of Formation would be in order IMO. Specifically, the Washington LLC Operating Agreement (I would bet there isn't any), the last x years of financial report and IRS form 1065. Sister (a CPA, even if not the CPA hired by the LLC) must know these things are required and should have copies of them. I wouldn't be surprised to find could turn out that sister is the sole owner of the LLC.
It seems like a lot of disconnects and missing info here. It sounds a lot like my MIL & FIL's Trusts and Wills that we just went through to straighten out! Be very cautious to dot your I's and cross the T's. Do not take anything sister says as fact. Require documentation of everything from Sis or from government sites, and keep copies of them for future use. Anything you can get on your own is just that much a lawyer will not charge you time for, and quicker to get some resolution.
It seems like a lot of disconnects and missing info here. It sounds a lot like my MIL & FIL's Trusts and Wills that we just went through to straighten out! Be very cautious to dot your I's and cross the T's. Do not take anything sister says as fact. Require documentation of everything from Sis or from government sites, and keep copies of them for future use. Anything you can get on your own is just that much a lawyer will not charge you time for, and quicker to get some resolution.