As the registered owner of the vehicle you have liabiity for up to $15,000 for death or injury to one person and $30,000 for death or injury to multiple persons, and $5,000 for damage to property. There is an online form to release future liability on your part for the car. Go to www.dmv.ca.gov/online/nrl.
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It's unlikely you'll be sued, since you are only responsible for the basic coverage amounts of 15/30 for liability and 5K for property damage and since your sister had insurance.
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