Of course, who says the affable Sgt. Benton might not have had a family on the side somewhere? And that he might not be so affable about Ten not properly appreciating that accomplishment in its entirety?
“But - you can’t take only one of them,” John Benton objected.
“Look, I appreciate that you’re being all fatherly and familial and all that,” the Doctor said, backing away. “But I only need one. I mean, I really appreciate your being willing to give him your blessings…”
“Them. You’re not splitting them up!”
“But they’re identical!” the Doctor protested. “I don’t want identical companions. Can you imagine the confusion…”
“Yes I can,” smiled Benton, but he was still firm. “Nevertheless, both or none.”
“Nonsense! One for me, one for you.”
“Alistair! Gordon! Come on lads, show’s off.”
“Aw, Daaaaad,” they chorused.