u/Draktris

I co-own commercial real estate in Sacramento, CA with several family members. One elderly owner/family member controls the finances and refuses to share financial data, forgets to pay property taxes, and refuses to listen to advice or ideas from attorneys, realtors, accountants, family members, etc. They refuse to sell.
They had a stroke years ago and their processing time is slow, speech is very slow and slurred.
Owners are all TIC, live in three different states, and inherited/purchased interest at different times.
Those of us who are business minded want to know if there is any recourse to remove this family member's decision making abilities, and make another one of us the main fiduciary. Is there anything I can do, besides force a partition action, and what kind of attorney, in what state, do I need?
Thanks.