Breathe. Relax. The polls are open until 8. You've got plenty of time. Your family will not let you nap until it's too late to get there. And for all that people are bragging about getting to the polls before they open, your vote cast at 7 pm counts just as much as their vote at 7 am.

(And it's conceivable that if you call your local campaign office and tell them "3 voters, no car" they will have someone pick y'all up...they do that kind of stuff. :) )