How do I tell him I want alone time with him.

Every time we make plans he has to invite his friends and his cousins or we make plans to go to dinner and he always invites his mom. We’ve been together for almost 3 years and we never do anything alone. I like his friends and family but I also want to spend time with just him. When we’re home he just wants to play games or watch videos on his phone. Any and all advice needed