We had Lars over one morning this past week. He and Lee are learning to play alongside each other. Sometimes they play with one another, like when they race our two push toys back and forth on the cement slab. However, most of the time they just do stuff beside one another. That 6 month age difference does influence their interaction. Lars will pick up one of Lee's trash trucks and ask Lee, "Where did this come from? Target? Cosco?" And Lee will stare at Lars for awhile and then say, "Digging truck." At least they're both talking about the same things. In the picture above, Lee and Lars are using some of the gadgets I got from your kitchen, Grandpa.
Lee is a good imitator. I read to him after his nap, so one day he did the same for Rose. When she kept wanting to grab the book and stick it in her mouth, Lee stood up.