In your explanation, Minister, you told us that these are discussions between parents or grandparents and children. I do not see this restriction in clause 320.101.
It seems to be open to anyone and allow for discussion with anyone else, such as a health professional, a counsellor or a spiritual leader, or even a teacher, without any restrictions. I could be having a discussion with the son of a neighbour a few doors away and be telling him that he appears to be behaving in a very heterosexual manner and that he should remain open to homosexuality, for example. If I have understood correctly, the exception could authorize this kind of thing.
Would it be more useful to specify more precisely which people are included in the exception provided in paragraph 320.101(b)?