How to deal with disrespectful teen

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Yesterday we had a visitor, the experience I had can be synonymous to a nightmare. well how, here is the story. The visitor we had is a teenager boy the brother of my brother in law about the age of 17. he being raised by his parents getting all that that he wants in one word he is a spoiled brat. So Sunday we share the same room. I treat him like a younger brother. he wakes me up early in the morning complaining he is sick. I cant get up because I still feel so sleepy so i asked him what is it all about. He said that he feel so much pain in his heart, i remembered he didnt eat anything Saturday night. So I told him the pain might come from that and he drinks sprite. he needs to go downstairs and eat cookies or cereals or whatever that he can stuff his stomach that is healthy.So he went down after a few minutes he sat next to me and command me 'get up' and i was saying at the back of my head 'who the hell are u', hehe but I didnt say a word. I get up and make him something warm to drink, and what i found out is that he ate chocolates in the morning. then he told me to wake up his brother and my sister. I told him they were sleeping. when I get back he was already in their room.He is telling them to bring him to the emergency, and that happened my bro in law took him there but before that he called his parents and his mama. He said he is very sick and he needs to go to the hospital. He swear at his mom. His parents said he doesnt need to go to the hospital but he insisted anyways. His brother and I were talking how did he got that pain, we think it came from not eating anything and drinking sprite. He yelled at us and told us his pain come from his lungs and he got a TB, and I laugh so hard. I told him that if he got tuberculosis he would have a cough a high grade fever and a blood in his sputum. then he yelled again its my heart I cant breathed. hehe so he was brought to the emergency, alas when he get back he is very well. The doctor said he is fine. So he is just making up stories so that everyone will get up and be bothered. then I was cleaning the battery rolled over his feet. he called me to pick it up. I said later as I was cleaning the house. I told him I will be there and I will pick it up. he get so furious and annoyed he called my name and shout pick it up now. I didnt do it. and he pick it and said I'm sick. then he slam the battery on the piano. So I was ok you were sick but he wants to go to the feast or fiesta of one town. He went upstairs dragging his steps full of loud noises. So i followed and told my sis if he is sick then he should stay home and rest. He get mad and said he doesnt want to see me. I said then go back to your home. Then I go down. My sis said to him to say sorry to me, but instead he said FU to my sis and left the house. Have you ever encounter a teen with this behavior? what will you do if you were me? would you also say the same? would you pick up what he wants you to pick up? where will you draw a line?