We found one dictionary that defines the word relation by birth:

Business (1 matching dictionary)

1. relation by birth: Legal dictionary

▸ Words similar to relation by birth ▸ Usage examples for relation by birth ▸ Idioms related to relation by birth ▸ Wikipedia articles (New!) ▸ Words that often appear near relation by birth ▸ Rhymes of relation by birth ▸ Invented words related to relation by birth