oy..I used to have some issues with this, but my family and I have worked out an understaning.
wayyy back when, (when I was 10) I was given a life long ban (turned out to only be a year and a half though) for ignoring my mom telling me something important, because I was engrossed with the game. there have also been a couple of other brushes with stuff like this (taking the GBA to school, playing when I had stuff to do , etc.).
now however, I've matured, they've begun to understand my passion for gaming, and there is not so much trouble going on anymore. Plus, finally, at age 18, they fully trust me to do whatever I need to do. no more looking over my shoulder and stuff.
also, IF I'm asked to do something, I jump up and do it. (If I can't pause, I will Tell them to wait a minute, get to a safe place, and then go) as a result, they know know that If I'm playing, I have nothing else to do, and I am ready to help if they need it.
basically, they developed a respect for my space, and I devoloped a bit of common sense. I don't game when I have major stuff due, and they dont complain when they see me playing almost all of saturday afternoon.