Calendar for --
The Sunday within the Octave of Christmas or, if there is no Sunday within the Octave, December 30th is the Solemnity of Holy Family of Jesus, Mary and Joseph.
The 2nd Sunday after Christmas is the Sunday, if any, from January 2nd to January 5th.
In the U.S.A., Epiphany is assigned to the Sunday from January 2nd to January 8th, however, the Anglican Use observes Epiphany on the traditional date of January 6th.
Also note: The calendar for the Christmas season is one of the most complicated due the number of liturical days which may fall within the twelve days of Christmas. There are seven variations depending on the day of the week on which Christmas Eve falls, as set forth in these notes.