There are so many differences between a four year old and a one year old. Patrick, for example, has 20 teeth. Melkamu has 6--and this represents a 50% improvement over the number with which he came home! Patrick loves to run and jump. Melkamu desperately wants to run and jump, but hasn't learned how to do so yet. Patrick is learning to read. Melkamu is learning to speak.
And then there are mealtimes. Witness:
A 4-year-old after eating a bowl of yogurt
A 1-year-old after eating an identical bowl of yogurt across the table
They do like to do things together, thankfully. They play and chase each other, wrestle and laugh. In some ways, 4 and 1 are not very different.
Apparently, 4 and 50+ are not very different either, as Patrick and Grandpa G demonstrate their Hawaiian shirt-wearing skills.