<prompt> Human: Title says all. Hes basically a dependent of me, but theres no way to legally prove it. For example, if I moved out, hed literally be homeless. If I were to not provide food, he wouldnt be able to eat. Were both 21 YO.Dude been living with me ever since April 27th, if that matters. Moved from CA CT.Lets refrain from the why are you supporting another grown man questions as Im just about at the end of the straw with this guy, but thats for another updated discussion.All bills that have ever been paid will have proof from my card. The rent, our phones, utilities, food, WiFi etc.I know this probably doesnt work as the legal definition of dependent, but I thought Id just ask.Thank you for your time!  <response>: You cant claim him as a qualifying relative dependent who is not actually related to you if he did not live with you all year long. See IRS Publication 17, page 26.You cant file as head of household because that actually requires you to have a qualifying person and the rules are more stringent and dont allow a non-relative qualifying relative as a qualifying person. See IRS Publication 17, page 24. 