The Messiah, His Brothers, and the Nations

Why does Matthew append ‘and his brothers' to Judah and Jechoniah (1:2, 11)? Secondly, why does Matthew include the following four annotations: ‘and Zerah by Tamar', ‘by Rahab', ‘by Ruth', and ‘by the [wife] of Uriah' (1:3-6)? Jason B. Hood uses a composition critical approach in which he examines biblical genealogies and ‘summaries of Israel's story' in order to shed light on these features of Matthew's gospel.