I am sick but my step dad needs help

My step-father has a lot health issues. He is already on oxygen and just spent a week in the hospital. It's not so bad but his mental facilities are beginning to fail him. After being in the hospital and getting some help, he realized how bad his house is, he needs help cleaning and help with a roach problem. I said no problem a couple of days ago, but now I am supposed to leave tomorrow but both my wife and I are sick. I don't think it's Covid but it could be. Even if it's not it's definitely affecting my ability to breath and giving me a fever. But, I told him I would be there and I don't think anyone else will help him with cleaning his house. What do I do?