Barracuda Dilema

You have to put on a "business" hat to deal with this.

Tell the guy straight up- I was told the cars were a gift to my dad because you needed them removed.

If you have the titles, and can show them to me, I'll offer $100 per car payable when they are in my hands, signed over, and free of issues.

If you don't have the titles, please come remove the cars ASAP.

Then look into a storage lien, as they are being stored on your property.

Maybe research what local storage facilities charge for outside storage and start sending a bill each month for a lower amount.