John 8:38

With my Father (para twi patri). Locative case of pathr and article used as possessive (common idiom), "by the side of my Father," picture of intimate fellowship like pro ton qeon (face to face with God) in Luke 1:1 . From your father (para tou patro). Ablative case with para (from the side of) and same possessive use of tou in each instance, though "the" will really answer both times. But o pathr does not mean the same person. Christ's Father by contrast is not their father.