Credit Score Help. Will having 2 car loans help or hurt my qualifications for a mortgage?

I just purchased a 21,000 car that I will payoff in 5 years. My brother in law wants to purchase a similar car but since he would always pay everything in cash, he has little credit and was told he needed a co-signer to qualify.
If I co-sign for him would that hurt me when I apply for a house 1-2 years from now?
Also once his credit builds up can he take me out of the loan down the road?
thanks

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