So, today I bought some rice cereal and tried it out on Aaron. After I spooned one runny spoonful into his mouth the light bulb went on over his head and he was hooked. For the second bite he grabbed my hand and helped me bring the spoon into his mouth faster.
Not to be outdone, Nathaniel wanted to help too so he sat on my lap and gave Aaron some cereal as well.
(please note how Nathaniel's mouth is wide open as he feeds his brother. Sam did the same thing when he fed Nathaniel food as a baby).
So, now Nathaniel really is the best big brother ever in Aaron's eyes. Not only is he entertaining (and has a nice full head of hair to pull on), but he gives him food too.