how does kate try to calm george down and show they have nothing to hide ?

From the text:

"Mother: (at last confessing the tension) Why should he argue? (she goes to him. With desperation and compassion, stroking his hair) Georgie and us have no argument. How could we have an argument, Georgie? We all got hit by the same lightning, how can you...? Did you see what happened to Larry's tree, Georgie? (She has taken his arm, and unwillingly he moves across the stage with her.) Imagine? While I was dreaming of him in the middle of the night, the wind came along and..."