<prompt> Human: Im looking for some advice on this Black Friday as Im torn on my options. The situations is:-My parents are looking to buy a 5 bedroom house that is listed for 800,000 for themselves and my grandparents-Their plan is to rent out some of the bedrooms to students at a nearby college when they retired in 2-3 years-Their original plan is to take out a Home Equity Line of Credit on our current house valued at 400,000 to get a mortgage for the new house, then sell our current house later-TODAY, they found out that the bank denied their applications since my parents together make below 35,000year. The bank asked for a high-income cosigner to proceed-I am 26 years old, currently in grad school, and have 22,000 of student loans with 1.5 more years to go. Although for 2015 and 2016, my pre-tax income was 75,000 which would satisfy the banks requirement-My mom, knowing this, asked me to cosign on their mortgage. She said that they would never default on their mortgage, that it could never affect me, and the whole thing would be over in a few months when the old house is sold-From the little bit of research I was able to do online, it seems like a larger obligation than shes making it out to be. My credit and my ability to take out a mortgage in the next few years would be impacted -She said that they have no other options and that as a good daughter I should do this for themI care a lot about my parents, but this isnt the first time they have asked me for things financially. They have asked for smaller things such as putting a 8,000 snowplow on my credit card because their limit is smaller - they did pay me back. Another time, they asked me to help them buy a convenience store that they would run. I had a bad gut feeling about that one and said no, they proceeded to buy it and realize it was not financially feasible for them to run it, and sold it at a loss a few months later.Sorry for the information overload! Im just very overwhelmed at this request on top of regular holiday personal finance stress. I dont know how to let them down or even if this is a good idea this is their retirement plan, so maybe I should support that?. I also feel terrible that my mom is guilt-tripping me and making it seem like I am keeping them from their dreams. One last piece of info, I am Asian and my parents have done their best to support me through undergrad by paying a third of my tuition. Its pretty common in our culture for children to help out our parents, but Im not sure if cosigning a mortgage goes too far.Your advice is very much appreciated.Edit: Thank you all for your thoughtsadvicesupport. I think what I need to do is to figure out all the details on the houses, the mortgage, the HELOC, their income...etc before I can get to a clear monthly breakdown and start asking them hard questions about what they plan to do in case of the downside as right now they are too distracted with the idea of the dream house. Its not going to be an easy conversation, but I am the only one who can do it. Again, thank you!  <response>: No good parent tries to guilt their child into being legally responsible for 800k. And how the hell do they think they can afford an 800k house on less than 35kyear? Theyre trying to buy way way too much house. 