Merged contacts with family member

I have a family plan which included a 6S, 5S, 5SE, and 5C. I bought my daughter the 5SE and I am now using the 5S. Problem is our contacts have merged. I now have all her contacts in mine. It must have happened when I tried to establish 4 separate iCloud accounts. Was not successful, and wound up with the merge. How can I fix this? Thank you