The Multi-Generation Register contains information about first-degree relatives18. The register contains entries for an “index person” along with their biological and adoptive parents. To be included in the register, an index person had to be registered in Sweden between 1/1/1961 and 12/31/2002 and to have been born between 1/1/1932 and 12/31/2002. Paternity was assumed to be the husband of the mother at the time of birth or “by acknowledgement” for unwed mothers.
