Ps4 – transfer GTA V saves multiple times

You have a couple of options:

1. Create a backup of your brother's PS3 using the Backup Utility and restore the same backup on your new PS3. This won't wipe any data off your brother's PS3 and will transfer most of the data on your PS3, excluding some data (like copy-protected saves and media). This will copy both your profiles to your new system, but you can delete your brother's data afterwards.

2. Copy just the saves. On you brother's PS3, plug a storage device like a thumb-drive, go to your profile and open the Game Save Utility under the Game category. You can choose to copy individual saves or all the saves at once to your storage device, then plug it into your new machine and copy them to your local profile. Please note that you should probably log to the same PSN account you've used on your brother's machine (if you had one) or otherwise the saves may be unusable. Again, copy-protected saves may not be available to transfer.

No. The PS4s hardrive format has given those issues when converting file formats from Xbox 1. Unless there is a way to do a simple file change in format, this is not a possibility.