I don't have mate, any siblings IRL that are furries or any cyber siblings. Nor do I have a father or mother on the forums.
Personally, I don't see the point in having a cyber gf, it's kinda awkward. Believe me, I've had one before and it's pretty weird sometimes unless you know them in real life as well. But that's not really on topic, is it?
SO: I would like having a brother and sister, but I like women better as siblings, they are just nicer to me. I'm glad that Shinzuu adopted you. He's a good guy from what I know.