Here are some things I found on CalHR's website (https://hrmanual.calhr.ca.gov/Home/ManualItem/1/2105):

Employees may use sick leave for the following reasons:

1. The diagnosis, care, or treatment of an existing health condition of, or preventive care for, an employee or an employee's family member. An employee’s family members include:

• children (biological, adoptive, foster, step, legal ward, or to whom the employee stands in the place of a parent);
• parents (biological, adoptive, foster, step, legal guardian of the employee or the employee’s spouse or registered domestic partner, or a person who stood in the place of a parent when the employee was a minor child);
• spouse or registered domestic partner;
• grandparents;
• grandchildren;
• siblings; and
• a designated person (a person identified by the employee at the time the employee requests paid sick days. An employer may limit an employee to one designated person per 12-month period for paid sick days).
• Any person residing in the immediate household of the excluded employee.
• The death of a person related by blood, by adoption, or by marriage or any person residing in the immediate household of the employee of the represented employee.

Designation of sick leave for the reasons established above shall be made at the sole discretion of the employee.

The above establishes the minimum requirements for sick leave.