Who is liable for initial property damage if a boy steals his mom's rental, rear-ends our car and totals it?

Question Details: An 18 year old steals his moms car, rear-ends our car off into a ravine and totals it. He tries to take off but his car leaked fluid and died out 1/2 mile down the road. Our insurance adjuster says the other party doesn't have the boy under their insurance nor does the boy live with them? Our adjuster also said our insurance won't cover anything for us right now or help with a rental. This all has to come out of our own pocket. Is this right?

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