<prompt> Human: My sister recently attained a decent sum of money. She is looking at buying a house with some of the cash. She is young and doesnt have an established credit history, and is leaning towards financing the house to build credit even though she has the capital to purchase outright. I have an excellent credit score, 760s, and she has asked me to co sign the mortgage. Will this hurt my credit score? I have no doubt that the payments will be made on time.I currently am renting a house for myself, would this hinder my ability to open a mortgage for myself a little down the road when I am ready to buy?  <response>: Tell her to get a credit card to build history. 