Parallel
Luke 2:44
Nestle 1904 Greek New Testament · Berean Standard Bible
νομίσαντες δὲ αὐτὸν εἶναι ἐν τῇ συνοδίᾳ ἦλθον ἡμέρας ὁδὸν καὶ ἀνεζήτουν αὐτὸν ἐν τοῖς συγγενεῦσιν καὶ τοῖς γνωστοῖς
Assuming He was in their company, they traveled on for a day before they began to look for Him among their relatives and friends.