It's very likely that their grandma(?) suffers from dementia (or similar), not really something to laugh about... that pose/face is pretty typical of someone that no longer understands the world around them/who their relatives are/etc.
@JonoMarshall started
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It's very likely that their grandma(?) suffers from dementia (or similar), not really something to laugh about... that pose/face is pretty typical of someone that no longer understands the world around them/who their relatives are/etc.