compaternity

[ kom-puh-tur-ni-tee ]
/ ˌkɒm pəˈtɜr nɪ ti /

noun

the relationship between the godparents of a child or between the godparents and the child's parents.

Origin of compaternity

1400–50; late Middle English compaternite < Medieval Latin compaternitās, equivalent to compater godfather (see com-, pater) + ( pater)nitās paternity