Privacy 🙈🍆

Soo, my boyfriend and I have been together nearly two years. We've had sex once, just after our 1st year anniversary actually. We we're very keen to wait, so we did. Buttt, that was a long time ago. And we haven't done it since, mainly because of one major problem 😬 We have NO privacy at all. Even our first time, his brother was walking around and nearly caught us. My mum doesn't work so she's always here and I have younger siblings. He is one of two boys and his brothers always home. And his dad installed cameras around the house! Any tips for privacy ? Suggestions for how ?