The divorce issues due to biology are a non issue. Adoptive parents don't have any biology & they still can have kids. In any relationship regardless of biology the child would go to the most stable parent with the most support & partners who don't want to suck it up & pay for the child in the divorce should just deal with it like heterosexual couples do. Its universally the same, you go into marriage knowing it could break down, you have children knowing if the relationship breaks down you could still be paying for them.
Psychological research has got support for same-sex couple children & other non-traditional family children as being no better or worse than children from heterosexual families.
Anyhow, really just wanted to say I had no clue Tony's sister was a gay activist. I hope she goes well.
Oh, I would just love to meet & talk to Tony Abbott. I can see it now, he says tell me about yourself, I say I'm a lesbian bastard daughter raised by a single mother & grandparents, from a working class Irish catholic background. I imagine from Tony's beliefs that he would figure I'm actually capable of transforming into a monster like from Aliens with acid blood - if only, that would be awesome.