| Value | Category |
|---|---|
| 0 | No answer |
| 1 | reference person |
| 2 | husband, wife, partner, partner |
| 3 | son, daughter |
| 4 | father, mother |
| 5 | father in law, mother- |
| 6 | in-law, daughter-in- |
| 7 | brother, sister |
| 8 | grandfather, grandmother, grandfather, great-grandmother |
| 9 | grandson, granddaughter, grandson, great-granddaughter |
| 10 | other (on) a relative (to) |
| 11 | an unrelated |