I believe I do have a timeline of events that you might find elucidative.
Vanessa describes the scenes for Walter. She uses nicknames for the characters, such as Buttons and Sheriff Combover.
Once the characters start speaking again, she leaves Walter to watch it alone.
She also gets a small plastic cowboy from the cracker, which she gives to her grandson, Benji. Benji is warned not to snatch by his mother, Hilla, who reminds him that “Level 3” behaviour is expected.
Deborah chooses to pull her cracker with her grandfather, Walter. Vanessa indicates to Walter that his cracker is on his side plate. Deborah wins, but questions if she has to rip up her hat. She asks if that tradition comes from them being a bit Jewish.
Hilla tells her that lighting the candles is because they are a bit Jewish, but that the hat ripping comes from the Wilkinson side. It transpires that the tradition dates back at least as far as Uncle Newt’s childhood.
As if to demonstrate, Vanessa enters the room at that moment. She says:
“Ah, Walter. There you are. Oh, and Deborah too. You look very cosy over there, dear, in that window seat.”
Vanessa uses indirect comments like this to help Walter place people and objects in the room.