38 Most read your sons as a reference to Jewish exorcists (cf. “your followers,” L&N 9.4), but more likely this is a reference to the disciples of Jesus themselves, who are also Jewish and have been healing as well (R. J. Shirock, “Whose Exorcists are they? The Referents of οἱ υἱοὶ ὑμῶν at Matthew 12:27/Luke 11:19,” 46 [1992]: 41–51). If this is a reference to the disciples, then Jesus’ point is that it is not only him, but those associated with him whose power the hearers must assess. The following reference to judging also favors this reading.
39 The pronoun “them” is not in the Greek text, but is implied. Direct objects were frequently omitted in Greek when clear from the context.

In other versions

And if I cast out demons by Beelzebul, by whom do your sons cast them out? Therefore they will be your judges.

And if I drive out demons by Beelzebul, by whom do your people drive them out? So then, they will be your judges.

And if I drive out demons by Beelzebul, by whom do your sons drive them out? For this reason they will be your judges.

And if I am empowered by Satan, what about your own exorcists? They cast out demons, too, so they will condemn you for what you have said.

And if I expel demons by Beelzebul, by whom do your sons expel them? For this reason they will be your judges!

And if I by Beelzebub cast out devils, by whom do your children cast them out? therefore they shall be your judges.

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