I'm translating a civil record to English, which has a table of information about a family registry. One of the titles is "Degree of Proximity", however I'm not sure which of the expressions suits the best in this context.
The items below that title in the column are: "himself, wife, son, daughter".
Wikipedia has an entry for Proximity of blood, and Google returns only 306,000 results for "degree of proximity" within the double quotes, which is not many.
What's the appropriate title I should use here?