> Page 171 of the 3.5 Dungeon Master's Guide explains how to account for being raised by a different race: you make a new race. The example it gives is the "half-human;" a half-elf raised by elves instead of by humans.
Page 110 of the Player's Handbook discusses less systemic changes as part of the normal process of character customization, and gives an example of changes for a dwarf raised by humans.