Can I get my van back?

Ok my van is titled in my name and father-in-laws names, only because i needed a co-signer for the loan. I lent it to my brother-in-law (his son), and

Ok my van is titled in my name and father-in-law's names, only because i needed a co-signer for the loan. I lent it to my brother-in-law (his son), and they are now telling me that I cannot take it back because his name is on the title. My name is listed first and all registration stuff is mailed to me. Trying to find if I can get in trouble if I go get it.

or:Ok my van is titled in my name and father-in-law's names, only because i needed a co-signer for the loan. I lent it to my brother-in-law (his son), and they are now telling me that I cannot take it back because his name is on the title. My name is listed first and all registration stuff is mailed to me. Trying to find if I can get in trouble if I go get it.

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