Siblings

Drew has been talking about siblings a lot lately; he wants one. I've reminded him that he does, in fact, have a half-brother (my birth son, Michael, who lives with his adopted family not far from us).
"Is he my half brother or my real brother?"
"Both. Your half brother is your real brother."
"Hmm. Same mommy, but different daddies, right?"
"Yep."
"AWKward!"