Our habit is to tell them what we’re doing and why it’s important that they wait until we’ve finished. “Are you finished with that important work email yet?” is a question I hear from my sons often. But it isn’t because I’m always on my phone; it’s only because when I am, I tell them exactly why. If I’m not willing to tell someone why I’m asking them to wait, usually it’s because there isn’t a good reason to ask them to.