Even Stephen found it funny that Arabella was joking. The look on Zatanna's face was absolutely priceless. "Best to stop jesting or your mother is going to have a heart attack in front of us both, and I'd hate to have to revive her." Which he was kidding, too, but still.
"You can tell me or not," he said with a shrug. "I don't think it will put any more pressure on me than finding out that we do have a child eventually. Or children. You haven't mentioned if there are more or not."
Then he glanced over to Zatanna, his arms crossed over his chest as he thought about how to answer her question. "Perhaps someday. You seem...agitated at the suggestion of impending nuptials."