The significance of a strength in nonverbal ability is somewhat dependent on the instrument, as the kinds of measures used for GT screening may not all define nonverbal ability exactly the same way. For example, sometimes what is meant by nonverbal ability is really fluid reasoning, while in other cases, it's visual spatial processing. I also hesitate to put too much interpretive weight on group measures, especially if you're inquiring about links to ADHD.
More importantly, you are attentively observing your children's interests and joys. I agree with Portia that following their interests organically is the way I would prefer.
