At what age can a person be in charge of minor sibling?

In the state of California, what age can a brother or sister of a minor babysit that sibling?

I am worried that my 6 year old son is being left alone with his 14 year old brother. Not just at home, but at theatres and out in public in general.

At what age can a person be in charge of minor sibling?opera music

The legal age is 12. A 12 year old can get a babysitting license. So, 14 years is okay.

At what age can a person be in charge of minor sibling?opera sheet music opera theater

12 or 13 in most places
I know that in Utah you have to be 12 in order to babysit,I 14 might be in the guidelines.