I did this with one of the few relatives I was close to, it was a disaster. She'd hounded me to go to uni in a local city and live with her, which I didn't do, but I did get a job local to her for my year out.
I ended up paying more than half my salary to her for food/bills/washing five days a week (expected to provide my own weekends and only allowed in the kitchen then, so not allowed access to the lounge except weekday evenings). I wasn't allowed to buy anything and she expected more from me than I could manage. I simply couldn't stay up until 11pm chatting when I needed to get transport to work at 6:30am (so getting up 5:30am) and didn't get back until 6:30pm. I was exhausted, it was my first job and very challenging (worth it, but it was hard work). Meanwhile she retired that year and did nothing during the day, didn't see anyone, refused to join clubs instead joining ones in the evening she wanted me to go to as well and I was too exhausted. She expected me to take time off when she was ill but I wasn't allowed. She wanted me to go away for two weeks over Christmas but I wasn't allowed the annual leave to do so - it was a year contract and annual leave booked in the first week. I wasn't allowed a key to the house or any post to go there.
I couldn't afford to go to the evening classes, cinema or theatre with her as she, transport and dept payments took all my salary, nor could I physically manage and do she did none of it either. I did treat her a couple of times to theatre trips. And when I left bought her flowers and chocs. But she didn't want me, she wanted the person she thought I'd be - going out every night with her etc. I learnt after she was bitching about me to everyone she could for being a burden and using her. I was devastated, I knew we had issues but thought she'd got over them, bug she hadn't.
Our relationship never recovered and I regret doing it. She died last year and despite trying for over twenty years I couldn't get our relationship back. I was devastated.
Look at other options.