What are ID numbers used for in Family Tree?

An ID number (identification number) is a string of letters and numbers that uniquely identifies a record in Family Tree. ID numbers consist of 4 characters, a hyphen, and 3 more characters. For example: K8LL-TGB. Family Tree ID numbers never contain these letters: A, E, I, O.

An ID number:

  • Shows on all tree views, on person cards, and on the Person page
  • Usually appears near the person's name
  • Is automatically assigned when a new record is created
  • Does not provide information about the person or the source of the information
  • Does not change for a given record


In Family Tree, you can use the ID number to:

  • Find records of deceased people.
  • Find records of living people, if you added them. The records of living people are only searchable to the person who added them.
  • Find the record of a deleted person and restore it if necessary.
  • Link a deceased individual into a family tree.
  • Merge records by ID number if you know the ID number of a duplicate. Both records must show as deceased. 


  • If you see the message that an ID number is invalid, it is no longer assigned to a record.
  • When you search by ID number, you can enter the number in lowercase letters, with or without the hyphen.
  • When you add a living person, a unique ID is created. When another patron adds the same living person, a different ID number is created.
  • You cannot merge the records of a living person with the same living person created by someone else. You can merge records of a living person only if you created both records.

How can I find a deceased person in Family Tree?
How do I restore a deleted record for a person in Family Tree?
How do I add a family member to the pedigree in Family Tree?
How do I merge possible duplicates in Family Tree?
How does Family Tree protect the privacy of living people?

Was this helpful?