i was trying to add music to my sons new ipod touch 4th generation, and accidently transferred all data from my daughters ipod...he now has all her photos messages etc and all his data, games, contacts etc are not there. Help? son very upset :-(

I was trying to input music from i tunes library from my daughters computer to my sons new ipod touch, his main xmas present! I accidently transferred all data from her ipod to my sons....messages , photo,s etc instead of clicking new ipod...my ipod shuffle is down as ny daughters device and i can transfer music onto that ok. i thought it would put music on my sons ipod but instead he has none of his contacts, games etc at all now on his, and is very upset :-( Anyone know if this can be reverted back and if my sons ipod can be retrieved please??