Another Nathanism

I was singing a bedtime song to Nathan a couple of days ago.  He sleeps on the top bunk so the top of my head was about even with his face.  He interrupted my singing, saying, "That smells like Grandpa Shepherd!"
"What smell?" I replied.  I couldn't smell anything in particular so I needed some clarification.
"That smell!  You know, hair--whitish, oldish..."
Actually, I didn't know.  But apparently my Dad's hair has an oldish, whitish smell of which my hair reminded him.