Need hekp with my Contacts

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http://androidforums.com – Hello. I have a Samsung Galaxy S Duos running ICS. I had a few contacts having the same last name. Also since i am 24x7 online via the phone i have synced all my accounts to my phone. So it is obvious that my contacts will show the respective merged contacts. Now here is the problem. I have stored a friend and his mother's contact separately. Also their google, whatsapp, google+, skype, oovoo , facebook accounts were already merged. Yesterday while merging a few contacts I accidentally merged my friend and his mothers' contacts. When i tried to separate them they did not. So someone (IDIOT)s (General)