According to Carola:

"He looked me and gave me a purple enveloped, he did it with a paper sheet and type, his eyes don't care how he could be sick, they continue shining; happy birthday Caro, it's for you!! 
I opened my present and my breath stop. He looked me i

n silence then I told him, Ender but your nana bought it for you!! And he answer me, I choose it for you, is me. I pretended to wanted it because I want to give you something for your B-Day!!! After that I started to cry

My little man, Ender."

Ender had been home for the past week after having his tonsils and adenoids removed.  He lost a few pounds and was in a great deal of pain.  His voice was weak but high and clear like birdsong; sounded not quite like his old voice.

My mother had been caring for him and as he felt better she would take him on errands with her.  When they stopped at an office supply store, Ender asked my mother for a Captain America thumb drive.  My beloved mother is not terribly savvy about information tech so she didn't really question what a six-year-old needs with a flash drive.  

Ender has shown remarkable proficiency with mechanical doo-hickies.  He has long since mastered my digital camera.  Most recently, I taught him to use Brian Y's old 1930's typewriter.  A unique feature is the lack of exclamation point.  To make one, I have to type an apostrophe, backspace, and then type a period beneath.  

Not terribly complex, really, but Ender remembered it with ease.  Better than me, anyway.

I try to be careful about assessing the twins' abilities since it is so easy to try to gauge them by my half-formed notions of what intelligence is.  

Ender would probably be described as "sensitive," but with that comes his ability to empathize and predict intentions of others.  It's a vital skill, though it certainly can be overwhelming at his age, and any age.