CALIFORNIA PARENT AS GUARDIAN FOR INJURED CHILD: Does a parent have to be the Guardian Ad Litem for a Minor Child's Bodily Injury Settlement in California?

No, anyone of sound mind over the age of 18 will suffice; usually, if a parent is unavailable, then a close family member is commonly selected like a aunt or uncle. I one time had a single parent who was in the Navy overseas and we used the grandmother to act as the Guardian Ad Litem or GAL.