Under normal circumstances the liar is defeated by reality, for which there is no substitute; no matter how large the tissue of falsehood that an experienced liar has to offer, it will never be large enough ... to cover the immensity of factuality.
People are asked to 'pick sides', blamed for 'picking sides', refuse to 'pick sides'. Well, sides are not a thing. You side with the truth. All of those stories have in common that one side has a familial connection, and that this family wants to 'keep the peace' when their side is literally not the truth.