December 28 is ordinarily the feast of the Holy Innocents in the Latin Church. This year, because December 28 falls on Sunday, it is superseded by the feast of the Holy Family, which always falls on the first Sunday after Christmas.
The painting here shows the Holy Family resting during their flight to Egypt, together with St. John the Baptist, painted by Fra Bartolommeo. This photo was taken by me. The museum's photo and more information can be found here.