Sieve: (noun, informal) unable to remember things well or can be used figuratively with reference to the fact that a sieve does not hold all its contents.
Source: Merriam-Webster and Oxford Dictionary
In the excerpt Brave We Are, the word sieve is mentioned. “His vagueness passes through the sieve in my head and comes out as clarity.” says Tahira on page 363. I had to find two definition to fully understand what she meant in this context. The first definition helps to show how she has sort of a bad memory and the second expands on that by allowing me to see how her son’s comment/question is vague but later realizes what he is talking about when he talks about Mary.
Diana Galvez