I bought all my kids cars. The cars are titled in my name for the younger ones.
A totaled car is it. I get the insurance money and I don't replace the car, they have to buy the replacement. The Bank of Dad does give interest free loans and I'm the lienholder on the title. Along with a contract, they have to keep timely payments plus ledgers of all earnings and expenses as it's a sliding scale car payment.
One child is pushing the limits and I don't give a fuck about family if my trust and effort is thrown to the wayside.