Hi there, Zack here from Online DMV, hope to answer your questions here!
First off, some bad news... In California, you can't directly transfer a foreign driver’s license to a US/California license. This means that your family member will have to apply for a new California driver's license.
In short, they'll have to start from scratch, going through and passing the written knowledge test, the vision test, and the behind-the-wheel driving test.
When they're applying for one, please remind your family member to bring their foreign license to the DMV, alongside a proof of identity, Social Security number (only if applicable), and proof of residency. That should be enough to get them started.
I hope that helps
