Am I wrong?

My husband is selling his younger sister a car. He wants to just hand it over to her right away & let her do payments. I feel like theres just so much that can go wrong with this! She's been talking about buying it for a few months & has not yet to give us money for it. *She has a job..  I also think that if anything happens to it while she has it, she won't finish paying it off... I think she should pay half of it before we give her the keys. Am I wrong?

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