Well wow, first of all I REALLY appreciate your help, second I have no idea how you do that... You have to somehow access the system folder.
You can try:
Connect the phone to pc via RECOVERY (you need root AFAIK) and copy whole system(not sd card!) and upload it.
Try to copy whole ./framework and ./app folder from system to sd card, using a file manager like... androzip.
Use KIES/nandroid to backup and upload your backup(no worries won't read your personal data
). Though dunno if we could use it... or how...
You can try google it!
btw what android version is your dad's galaxy using? It's very important info! Thanks.