the way in which a person is related to somebody else in a family
نسبت, قرابت, خویشاوندی, رابطه خانوادگی, نسبت فامیلی
They have a very healthy father-son relationship.
I'm not sure of the exact relationship between them—I think they're cousins.
their relationship to each other
He claimed to have a distant relationship with royalty.