Half siblings (I hope they look like they are but anyway, same mom but different dads), about 4 years apart I guess: in this pic, the sister (the one on top) is about 5 or 6 years apart at the time while the brother is about 9 or 10. I read that a female Fraser's dolphin gives birth every 2 years, so the mom had at least one calf or maybe two between them, but they died for some reason or other I haven't thought of yet. I also don't know whether they're mom is still alive or not. But anyhow... Fraser's dolphins live in big tight-packed groups of 100 to 1000 that contain both genders and all ages, so I think it could be possible for these two to have a close long-term relationship. Obviously OCs, who both still need a lot of work... I might even make a few more changes to their designs, probably just slight though 'cause there are lots of other things about 'em I need to work on, and TONS of other OCs who also need lots of work. \o/