Coleridge wrote "Metrical Feet" for his son – the "boy" mentioned in the title. The speaker actually talks about family, and fatherhood more specifically, in the second stanza. He suggests that poetry is one way to win love from both your father, and God. In a way, he's making a connection between success in art and success in your family. After all, what father wouldn't want his son to follow in his footsteps?
For a brief moment, the speaker implies that his son must "win" his love, as if it weren't merely a given.
The rhyme on "ridge" and "Coleridge," a rhyme on Derwent's father and a natural feature, suggests that delighting in nature might be the same as delighting in one's parent.