TS3998: iCloud: Troubleshooting iCloud ContactsLearn about iCloud: Troubleshooting iCloud Contacts
Currently Being ModeratedDec 3, 2012 11:46 PM (in response to srntuv)
Signing in and out of iCloud does not delete the contacts stored on the iCloud server. If your contacts were on iCloud before your sister signed into her iCloud account, they will still be there when you sign back in to your account.
Alternatively, you'll have to restore your contacts from your most recent computer backup.