I made a conscious choice when my children were very small to attend diligently to their (often inane) questions, because I wanted to firmly establish in their minds that Dad Listens. That was in the hope that when they had questions at 12 or 16 or 18 (the age of my youngest), important questions that might have serious consequences, they would ask me instead of their friends. That has worked out very well. Note that was Dad Listens, not necessarily Dad Has the Answer. I did, back when they were 3. Not as often anymore! But I still listen.