Ds2 has made enormous progress in understanding simple narratives. We have allowed him to watch more Thomas videos, etc, because he now acts out variations on what he has seen in his own pretend play (for instance, I have bought him Harvey, because Harvey is a rescue engine, and he learnt about rescuing from tv - he didn't understand the concept before). He asks me to act out danger-rescue narratives with him a lot.
Unfortunately, a side effect is a new kind of echolalia. He is starting to answer me with "Yes Sir" or "Of Course" instead of "yes". I recall DS1 using "I will!" (which the Thomas trains say) instead of "yes" but it wasn't this bad.
Worse, he will repeat stretches of tv programmes to himself with evident enjoyment ("have a drink, you'll feel better", said Percy. "no I won't" said Thomas), and say the odd line or two whilst at meals, clearly oblivious to the fact that he isn't communicating. Often it is prompted by something that has just happened (eg DS1 announces he needs a drink - DS2 then answers with a quote).
We know his condition runs in the family and I recall being very caught up with the patterns and rhythms of certain phrases. I would repeat them to myself endlessly (but in bed alone, not out loud).
Given that he tends to rote-learn at an early stage of understanding things, do I just accept this and ride it out? Or is there anything I can do? It's been going on a few weeks and is a bit irritating. But he has a delayed "theory of mind" and I think the language we would use to explain this might be beyond him.