In my embarrassed confusion I shall have to resort to this:
In non-technical contexts, the term “homonym” may be used (somewhat confusingly) to refer to words that are either homographs or homophones.[1] The words row (propel with oars) and row (argument) and row (a linear arrangement of seating) are considered homographs, while the words read (peruse) and reed (waterside plant) would be considered homophones; under this looser definition, both groups of words represent groups of homonyms.
My two daughters knew how to use they’re, there, their correctly from the age of 8 or 9. They are now (15 / 13) possibly even more pedantic than me about misuse. It can be done.