Final answer:
The poet with a brother named Aubrey Nash is b) Robert Frost, and he actually had only two brothers. This makes the interpretive answer to the riddle Robert Frost, with a total count of three brothers including himself.
Step-by-step explanation:
The poet referred to in the clue, who had a brother named Aubrey Nash, is Robert Frost. Robert Frost had a total of three brothers, including himself and Aubrey Nash, which corresponds to option b) Robert Frost, 3.
Amongst Frost's siblings, his brothers were Carroll and Sidney. Aubrey Nash is not a well-documented brother of Frost and seems to be introduced as part of the riddle, but deciphering the clue leads to identifying Robert Frost as the correct poet.
It's important to note here that misinformation about Aubrey Nash being one of Robert Frost's brothers might be intentionally added to make the clue more challenging or is a typographical error.