I suspect you might be training a little Vanessa there. Her dad gave her the bug. I'm guessing you'll have him accompanying you on his own little Uke as soon as be can wrap his fingers around one. I give it three years. he doesn't have a chance. just the way it should be.
I agree with Bob. You definitely got his attention with your fancy lead lick. But I reckon that he's actually giving you the 'yeh, whatever Pops' attitude because you didn't get him to accompany you on the drums. it's in his blood. You can see him being frustrated that his toy is neither a drum nor a drum stick.
Just a thought.
BTW - Abel has been doing a lot of growing since we saw him last. What a little cutie.