If an interest in tangible personal property is sold, under the terms of a good faith, bona fide contractual relationship, to another person who either before or after the sale owned or owns a joint or undivided interest in the property with the seller, and if the taxes imposed by this chapter have previously been paid on the tangible personal property, the tangible personal property is exempted from the taxes imposed by this chapter.
Official text of the Texas Tax Code as published by the Texas Legislative Council.