I enjoyed doing this scene because it was just so ridiculous.
She was slapping his hands, not his junk, but I thought it best summed up her disappointment, rage and exasperation at him and the situation. I mean he literally starts wanking as soon as they storm off. What a guy.
In the standard edition, I still hold that she's naturally taken on the motherly role to the younger ones. And they've gladly accepted it. So far.
No matter how you prefer to view their relationships, years together, scrabbling and surviving, have given them strong 'family' bonds.