A few variables would dictate what I'd do.
Assuming:
1) Family is together
2) It is not winter
3) We know the approximate location that ground zero is going to be
The wife and I would hop onto the motorcycles with 2 passengers (kids) each and take off in the opposite direction of ground zero. Traffic woul not be a problem as I know all of the routes out of town and bikes generally can go most places. We could travel about 10 kms in the 4 minutes. Based on the most likely target of a nuke strike in our area (Niagara Falls Hydro Electric Generation Facility), that 10kms would get us out of the entire blast range for a ground or air delivered nuke. Use this site to determine blast radius. (I am just outside the 7.4 mi (11km) outer blast radius.)
Otherwise, assuming the bombers had terrible aim and hit my town instead if hitting a useful target, then I guess I would just tap my tricorder and indicate that there are 6 to beam up.
Edit: As an added note, everyone would take a precious second to either eat a spoonful of iodized salt or eat something heavy in iodine before taking off. Saturating your thyroid with non-radio active iodine is a good idea especially if you are going to be subject to fallout.
Edited, Jan 15th 2007 10:25am by Elderon