A couple of years ago I surrendered my green card now my wife and kids are back in the states and they are citizens how do I go about obtaining a green card againg and move back with them.

Here is all the information you need: USCIS - Green Card (http://www.uscis.gov/portal/site/uscis/menuitem.eb1d4c2a3e5b9ac89243c6a7543f6d1a/?vgnextoid=ae853ad15c673210VgnVCM100000082ca60aRCR D&vgnextchannel=ae853ad15c673210VgnVCM100000082ca60a RCRD)

Your USC wife can petition for you again. Depending on how and why you relinquished your previous permanent residency.