Hi, sorry I’m not an ADHD parent but an ADHDer, I have had obsessive interests since childhood continuing until now (I’m 21). When I was younger I would watch the same DVD’s so many times over that I could repeat every single word. When I was about 9 or 10 I watched Happy Feet so many times that I even learned the Spanish lines spoken by the Spanish penguins and even started to teach myself Spanish. From there I became so intensely interested in Spain and Spanish that I wrote a 56 page story (unfinished) which was set in a fictional universe called “Stain”, in which I had certain characters speak Spanish.
… Yeah haha I’m sure you will get responses from ADHD parents, but wanted to share my perspective also.