There is a nice moment in George W Bush’s excellent book, Decision Points, in which he recounts the first time he set foot in the Oval Office as President:
The door to the Rose Garden swung open. I looked up and saw Dad.
“Mr. President,” he said. He was wearing a dark suit, his hair still wet from the hot bath he’d taken to thaw out.
“Mr. President,” I replied.
He stepped into the office, and I walked around the desk. We met in the middle of the room. Neither of us said much. We didn’t need to. The moment was more moving than either of us could have expressed.