The relationship of John the Baptist and his cousin, Jesus of Nazareth, serves as an excellent springboard for a discussion of all-important relationships in genealogy.

This article was originally published in November 2014 and updated on Dec. 4, 2020 to include a revised chart, additional attribution, and clearer and more thorough information.

Many genealogy sites offer a free, helpful chart that provides a quick answer. The form has various names: family relationship chart, cousin calculator and kinship chart.