Parallel
Romans 9:8
CNTR Statistical Restoration · Berean Standard Bible
Τοῦτʼ ἔστιν οὐ τὰ τέκνα τῆς σαρκὸς, ταῦτα τέκνα τοῦ ˚Θεοῦ, ἀλλὰ τὰ τέκνα τῆς ἐπαγγελίας λογίζεται εἰς σπέρμα.
So it is not the children of the flesh who are God’s children, but it is the children of the promise who are regarded as offspring.