Characters
You know what this family needs? A mute.
— Gus · The Ref

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker offers a dry, exasperated verdict on a family: what it lacks is someone who cannot speak. The remark treats constant chatter or noise as the problem and silence as the cure. Its humour comes from the deadpan way a wish for peace is phrased as a diagnosis.
Context reviewed