I assume given the context of the conversation, that the parent of the draft-aged male in question currently has employment within the upper echelons of the legal industry.

Admittedly, "like a son of a judge will be drafted" could have been a complete non-sequitur, and the link that followed it likewise a complete non-sequitur, but the more probable case is that "like a son of a judge will be drafted" and then linking something that lists familial relations when questioned on the validity of the statement would be likely some sort of proof of the statement.