Relationship to primary family (FRLF)

Latest release
Census of Population and Housing: Census dictionary
Reference period
2026

Definition

This variable describes the relationship between families in a multi family household. The variable family number (FNOF) identifies the primary family and any other families in the family household. 

The variable shows the relationship between each additional family to the primary family. For example, a household may include a primary couple family with children and a second couple family. If the second family are the parents of the mother in the primary family, their relationship is coded as ‘Mother’s/father’s/parent’s family’. 

Scope

Two or more family households 

Categories

CodeCategory
1 Mother's/father's/parent's family 
2 Grandparent's family 
3 Son's/daughter's/child's family 
4 Grandchild's family 
5 Brother's/sister's/sibling's family 
6 Other related family 
7 Unrelated family to primary family 
@ Not applicable 

Number of categories: 8 

Not applicable (@) category comprises: 

  • primary families in multi-family households 
  • one family households 
  • non-family households 
  • non-classifiable households 
  • unoccupied private dwellings 
  • non-private dwellings 
  • migratory, offshore and shipping SA1s 

See Understanding supplementary codes for more information. 

Question(s) from the Census form

What is the person’s relationship to person 1/person 2?

For each person away, please complete the following:

How this variable is created

This variable is derived from the relationship in household (RLHP) question on the Census form. This question identifies how people are related in a multi family household. It also includes information about people who are temporarily absent. 

History and changes

This variable was first introduced in 1991.  

In 2026, the variable name was updated to more accurately describe what the variable represents, and the category labels were updated to align with changes to questions on the Census form. 

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