A.T. Robertson Commentary Luke 15:21

"And the son said unto him, Father, I have sinned against heaven, and in thy sight: I am no more worthy to be called thy son." — Luke 15:21 (ASV)

The son made his speech of confession as planned, but it is not certain that he was able to finish as a number of early manuscripts do not have "Make me as one of the hired servants," though Aleph B D do have them. It is probable that the father interrupted him at this point before he could finish.