I would never tell my children (or anyone) to keep a secret. Secrets are not safe and healthy.
I, like many parents, have taught my children that some things are private matters, and when you share them, do so honestly with sensitivity and consideration.
If I had to convince my children not to share Storm's sex (which I don't because my children simply are not interested at this point) — I would teach them that someone else's genitals and sense of how they relate to their gender is their private business, to be shared by them or in a context where safety and acceptance are paramount.
Kathy Witterick, Toronto Star, May 28, 2011