It's bath night for Rosie and, as usual, that means chaos as she insists on using all of the bubble bath. Emily strategizes that she can trick Rosie into getting out by putting the bubble bath tantalizingly out of reach, then leaves the bathroom and secretly waits outside to pounce. Rosie falls for it, and Emily wins this round of 'bubble chess'. But the game of 'bubble chess' swings back and forth and becomes more complex as Rosie works out what is going on and how to stay one step ahead of her mum. It ends in bubble-filled carnage as both Simon and Emily battle to get an unwilling and slippery girl out of the bath. In the earlier timeline, Emily struggles to connect with Rosie, whereas Simon has a bonding moment when she does the biggest poo he's ever seen. Tensions build between them over whether, given a magic wand, they would change Rosie.