Generally an individual family member is appointed as the conservator on a petition to the court.  In some circumstances, a private fiduciary is appointed.

Unless the incapacitated person has previously nominated a conservator in his or her power of attorney, the following is the order of preference:

1. Spouse or domestic partner 

2. Adult child  

3. Parent  

4. Sibling  

5. Any other person the law says is okay  

6. Public Guardian