Family type: Children, full siblings, and half-siblings
| Number of Children Born in 1986–1988 to Norwegian-born Parents | 146,923 |
| Number of Children Living With Both Biological Parents Until Age 18 | 79,466 |
| Number of Children in Simple Nuclear Families (NFo) | 72,052 |
| % no full siblings | 2.7 |
| % one full sibling | 38.8 |
| % two or more full siblings | 58.5 |
| Number of Children in Complex Nuclear Families (NF+) | 3,208 |
| % no full siblings | 10.6 |
| % one full sibling | 46.6 |
| % two or more full siblings | 42.8 |
| % one nonresident half-sibling | 70.0 |
| % two or more nonresident half-siblings | 30.0 |
| % of children nonresident half-siblings aged 0–5 | 17.0 |
| % of children nonresident half-siblings aged 6–10 | 37.4 |
| % of children nonresident half-siblings aged 11+ | 56.3 |
| % of children nonresident half-siblings with 0–5 years of overlap | 18.5 |
| % of children nonresident half-siblings with 6–10 years of overlap | 30.1 |
| % of children nonresident half-siblings with 11+ years of overlap | 51.4 |
| Number of Children in Nonnuclear Families (NNF) | 63,258 |
| % no siblings | 4.4 |
| % no full siblings | 26.0 |
| % one full sibling | 42.3 |
| % two or more full siblings | 31.7 |
| % no half-sibling | 51.7 |
| % one half-sibling | 18.4 |
| % two or more half-siblings | 29.9 |
| % half-siblings both parents | 17.0 |
| Number of Children Born in 1986–1988 to Norwegian-born Parents | 146,923 |
| Number of Children Living With Both Biological Parents Until Age 18 | 79,466 |
| Number of Children in Simple Nuclear Families (NFo) | 72,052 |
| % no full siblings | 2.7 |
| % one full sibling | 38.8 |
| % two or more full siblings | 58.5 |
| Number of Children in Complex Nuclear Families (NF+) | 3,208 |
| % no full siblings | 10.6 |
| % one full sibling | 46.6 |
| % two or more full siblings | 42.8 |
| % one nonresident half-sibling | 70.0 |
| % two or more nonresident half-siblings | 30.0 |
| % of children nonresident half-siblings aged 0–5 | 17.0 |
| % of children nonresident half-siblings aged 6–10 | 37.4 |
| % of children nonresident half-siblings aged 11+ | 56.3 |
| % of children nonresident half-siblings with 0–5 years of overlap | 18.5 |
| % of children nonresident half-siblings with 6–10 years of overlap | 30.1 |
| % of children nonresident half-siblings with 11+ years of overlap | 51.4 |
| Number of Children in Nonnuclear Families (NNF) | 63,258 |
| % no siblings | 4.4 |
| % no full siblings | 26.0 |
| % one full sibling | 42.3 |
| % two or more full siblings | 31.7 |
| % no half-sibling | 51.7 |
| % one half-sibling | 18.4 |
| % two or more half-siblings | 29.9 |
| % half-siblings both parents | 17.0 |
Notes: Complex is defined as having at least one nonresident half-sibling. We omit 4,199 children from this classification because their father's identity is missing, their place of living (living abroad mostly) is missing, or the child died before age 18. Among those who grew up with both biological parents are 4,206 children who grew up with both parents in different kinds of blended families. The number of siblings and half-siblings is counted at age 18. Among our 75,260 eligible children in NFo and NF+ families, 7.75% have full siblings who were born in 1986–1988 and, hence, are also included in our analysis.