So, every few days since the beginning of the school year, my youngest has said "I love you B-" when his brother gets out of the car at school in the mornings. He ventures to say this once or twice a week as Eldest is closing the car door. Eldest never responds. This is typical of both kids, Youngest being very affectionate and Eldest being, well, not so much.
Each time he is ignored, Youngest sighs and comments on how his brother doesn't love him. In the beginning, I would make excuses about how Eldest probably didn't hear him. More recently I have explained that Eldest is getting to that age where "I love you" is a bit embarrassing. Youngest isn't happy but has become accepting of this.
This morning, as he was closing the car door, Eldest said "I love you N-". I paused for a moment, totally surprised by what had just happened. I smiled to myself and, after a few seconds, proceeded to drive away. From the back seat, Youngest said, "What, he thinks I'm going to marry him now or something?".
Such is brotherly love.