"Dinner is ready." AJ wanted nothing more than to not have to get involved in the middle of this when Mal was being a straight out bitch and had gone just a step too far. If anything he would wait until dinner was over to make sure his sister got back to her car and then have it out when there weren't little ears right there. It was bad enough that he was as close as he was when things were going down. "If we can all be civil."
He just went and took Mari's hand with a small squeeze. He might not be vocalizing it, but the intent was clear. 'Don't get mad at my wife for something she has no control over just because you can't get pregnant.' Not to mention the known fact that both of them were adopted would have almost amused him if he could have read her mind. It wasn't as though she was going to be required to publish it on her forehead that she couldn't reproduce of her own accord. The only reason for even telling them seemed more like a move for sympathy and now she was just backlashing on the one Swafford that was most likely to give it to her.