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 f...