I have read a few threads where a someone will say they have BFS only to find-out that their dad or mom had the same thing at one point, but on the other hand, there are a lot more people with no one in their family that twitches... so, here we are in the unknown zone again. This stuff is hard to put your finger on and just about the time you think it is totally stress related, you'll see posts from people that had no stress and had peachy lives until one day they started twitching and after reading about twitches and ALS, freaked-out. There's also that theory about a virus causing it and then you'll read post after post where no one had any cold or flu symptoms at all and this stuff started, so again, it is really hard to pinpoint an exact cause. The hereditary question was good though and who knows? So far, I haven't seen anything that proves it one way or the other. If we keep asking questions and gathering information collectively, we will probably find some answers one day, so keep it up!