Co-sign for my sister’s house hack?

[Dallin Johnson]

After doing a little bit of research, I’m not sure if this is possible or not. My sister is going to college in northern Utah next year and I was wondering if I could co-sign on the loan to purchase a house so it would be her primary residence and she would be technically house hacking it but I will be providing all of the financing for it. Once she no longer lives there, I would hold it as a rental property. Is it okay for me to co-sign for her primary residence so we only have to do 3.5% down? What about the implications after she no longer lives there?