Joda (age 5) asked me to come over to where she was working so she could explain the word "tear" (water drop from eye) [IPA] to me.
She drew several pictures of people crying and had written <tear>. Looked up the etymology... I wrote <teary> and <tearful> and asked her if they might be in the family with <tear>. She saw they had the same letters, and she was able to read them. I talked out word sums for them, just as practice for myself (she started drawing again and wasn't really listening to this part).