I think we have to look at the cases that have already taken place, which are the McIvor case and the Descheneaux case. There certainly are lots of statements in there about the gender and sex discrimination of the second generation cut-off.
I take your point that there has not yet been a case analyzing sex discrimination in the requirement of two parents, but I have analyzed that myself, and it is serious. Some people have spoken about that this morning. It is very easy to tell who is a mother. It is not as easy to tell who has donated sperm for the creation of a child. The other thing about this is that women face not knowing the father of the child in situations of rape or gang rape. They also face intimidation in situations of incest for not being able to put the name of a known father on the certificate.
The two-parent rule is absolutely ripe for successful section 15 challenges.