OMG!!!

So I yesterday my boyfriend's brother walked in on us having sex. My boyfriend is acting super weird now even though his brother said it's cool and he wasn't going to make a big deal out of it. He's afraid that his brother will go running to their parents. My parents know I'm having sex but apparently his don't. He's freaking out and idk what to do. His paranioa makes me want to worry but ik that it's not going to solve anything. Help!?!?!