This pertaint to good faith in a transaction and onus lies on A's advocate to prove that the contentions of B is false with available relevant evidence. But if the said witness who was 12 years at the time of the transaction testify the fact that A took money from B by selling his share to B, that will be conclusive proof as against A in favor of B, unless it can be shown with relevant fact that B was under the domination of B, which in the present case is missing, that is dominering power of B against A.