Sundays too my father got up early
And put his clothes on in the blueblack cold,
Then with cracked hands that ached
From labor in the weekday weather made
Banked fires blaze. No one ever thanked him.
On Sundays the speaker’s father would wake up earlier than everyone else and get ready to start his day. He wants to make sure that his family awakes to a warm house. The father is a very quiet man who shows his love through actions rather than verbally. We can assume that he cares about his family’s well-being as well as the value of hard work. 
 The subtle “too” in the opening line implies that his father also wakes early on all other days of the week. 
 “Blueblack cold” blurs the feel of the cold with the vision of darkness, creating a succinct cross-sensory effect, known as  synaesthesia . “Blueblack” also suggests bruising, but of an emotional nature. 
 The cold is emphasised early and often, and reflects the uncaring response of his family, symbolizing solitude and emotional distance. 

Those Winter Sundays