in 2008 & 2009 me my dad and my little brother went to mexico for about two months vacation driving, my dad has papers/green card and me and my brother were born in the u.s. when we came back into california all we needed to show was my dad's papers and me and my brother's birth certificates and school i.d's.. Now were planning to go again (once agains driving) but i've been hearing that to travel out of the country you need a passport, but were only going to Ensenada, Mez. in Baja California and didnt need it back in 2008? besides were driving so i doubt we need it.. Will we be okay doing this again??