<prompt> Human: Im 28, married and my wife and I make pretty good income but we have pretty mediocre credit due to some poor past decisions that were working through right now. Were both in the very high 600s very low 700s. Both sets of parents have very very strong credit, is there any downside to asking them to co-sign with us to get a better interest rate? Its not going to be an expensive car, and I know our parents will not be worried about us ever not being able to make a 220 car payment. Is there any reason I should not ask them to co-sign to lower the interest rate?  <response>: There are plenty of downsides-- for them. If you can get them to do this, its all upside for you. 