There was a very clever scam a few years ago, with Fords mainly, a dodgy garage would sell you a car with the immobiliser chip glued in on the inside on the steering column overriding the immobiliser - wait a week and then they'll steal the car back using any old key from the manufacturer. Cheaper than cloning the key and then sell the car on again and again under different plates. lol
Glad you have it fixed, parents do the weirdest things and never fully explain what they've done - just like kids!