My cousin and I had a fight!?

My cousin and I were having a good time watching MMA until, I got up to get a drink of water and started to act like I was about to fight him by going up to him,but no and then He pushed me jokingly, and I took it seriously and we got on the sofa and he had me in a lock, but I accidently poked him in the eye and He was at my house by himself for summer, to stay here and he started to call me names like psycho, janitor, ******, mental, ad I got pissed and called him psycho and told him to get out of my house, but he said that it was his house and I got angry and drowned his face on a pillow, and he said dont get physical with me and I just left. Hes 5'10 160 lbs and age 19 and Im 5'5 115 lbs age 15 1/2. He called me names in front of my mom, dad, my brother and sister is that awkward? We both have ADHD, he takes muay thai, and I take shaolin kung fu. What should I do?