If your family's car insurance liability limit is too low, you could be on the hook for thousands of dollars. By Kimberly Lankford, Contributing Editor June 27, 2012 My wife, 18-year-old son and I have a multicar insurance policy with a $300,000 liability limit. My son drives one of our cars daily, but the title is in his mother’s name. Are we financially liable beyond the $300,000 if my son causes an accident? And would it make a difference if the car were titled and registered in his name?You could be on the hook for any damages above $300,000 if your son – or anyone in your family – causes a major accident. That is a good reason to boost the liability limits on your car insurance, especially if you have a teenage driver, and to consider buying an umbrella policy. With umbrella coverage, you can add $1 million or more to your auto and homeowners liability coverage, generally for $200 to $400 per year. See Why You Should Have Umbrella Liability Insurance for more information. CALCULATOR: How Much Umbrella Insurance Do I Need? If the car were titled in your son’s name, he could get his own insurance, which should limit your liability. But it can be very expensive for an 18-year-old male to buy auto insurance coverage on his own; it’s usually less expensive to keep family coverage with a multicar discount. See 8 Ways to Cut Insurance Costs for Teen Drivers for details. For more information about saving money on auto insurance, see 4 Reasons to Reshop Your Auto Insurance. Got a question? Ask Kim at firstname.lastname@example.org.