Thanks to you all.... mamaof4, he IS exhausting!!!! The little guy absolutely cannot sit still for longer than a minute or two at a time, unless he is "stimulating" himself in one of the ways I mentioned above. He is very persistent (NO means very little to him) and as I said, strong-willed. He is the first child (mom just found out she is expecting) and altogether a sweet little man, but PHEWF.
I will observe his behaviour after they return from my month off.... I think if he is still doing this, or much of the characteristics are still there anyway; I will try to summon the courage to mention it. Yikes. I dread having to ask/mention anything. People can get soooooo defensive about thier kids.