What is the distribution of shares when one of two sons admits to having two brothers, and the younger son confirms the existence of only one of those admitted brothers?

Primary text

When the elder son claims two brothers and the younger confirms only one, the agreed-upon lineage is established, resulting in three individuals initially. This creates a scenario of an admission issue among three parties and a denial issue among four parties. The division is calculated by multiplying the admission scenario by the denial scenario, resulting in twelve parts. The younger son receives a share corresponding to the denial scenario multiplied by the admission scenario, resulting in four parts. The elder son receives a share corresponding to the denial scenario multiplied by three parts. The agreed-upon sibling receives a share equivalent to the elder son's share if the elder admits to him, or the younger son's share if the younger denies him.